Patent ID: 9725453
Date: 2017-08-08
CPC Classifications: A61P,C07D

Claim:
1. A compound selected from the group consisting of: (−)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydrofuran-3-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-tert-butyl 4-(2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-4-oxo-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-7-yl)piperidine-1-carboxylate; (+)-tert-butyl 4-(2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-4-oxo-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-7-yl)piperidine-1-carboxylate; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(piperidin-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(piperidin-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydrofuran-3-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-(1-(3,4-trans)-benzyl-4-methylpyrrolidin-3-yl)-7-(tetrahydrofuran-3-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-3-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzonitrile; (+)-4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzonitrile; (−)-2-((3,4-trans)-1-((6-methoxypyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzonitrile; 2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(1-methylpiperidin-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((R)-1-phenylethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((S)-1-phenylethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(4-(trifluoromethyl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(3-(trifluoromethyl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,4-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-(trifluoromethyl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-fluoro-5-methoxybenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(isoquinolin-7-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinolin-6-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,5-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,3-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(o-tolyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(isoquinolin-6-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(quinolin-7-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-oxo-1,2-dihydropyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridazin-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridazin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinazolin-6-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinoxalin-6-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinoxalin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-benzo[d]imidazol-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo [d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzoyl-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-fluorobenzoyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(3-fluorobenzoyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzoyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-nicotinoylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzoyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzoyl-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylpyrimidin-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(imidazo[1,2-a]pyrimidin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(phenylsulfonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-fluorophenyl)sulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((4-fluorophenyl)sulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)sulfonyl)benzonitrile; (−)-2-((3,4-trans)-4-methyl-1-(phenylsulfonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((4-fluorophenyl)sulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)sulfonyl)benzonitrile; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-5-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidine-1-carbonyl)benzonitrile; (+)-2-((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidine-1-carbonyl)benzonitrile; (−)-2-((3,4-trans)-4-methyl-1-(pyrimidine-2-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidine-2-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-isonicotinoyl-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-4-((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidine-1-carbonyl)benzonitrile; (−)-2-((3,4-trans)-4-methyl-1-(pyrimidine-5-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrazine-2-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((3-fluorophenyl)sulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)sulfonyl)benzonitrile; (+)-2-((3,4-trans)-4-methyl-1-(quinolin-7-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-picolinoylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(quinoline-2-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrimidine-4-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylsulfonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-methoxybenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-methoxybenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-methoxybenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(quinazoline-2-carbonyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-methylbenzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(3-methylbenzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(4-methylbenzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(ethylsulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(ethylsulfonyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(cyclohexylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(4-(pyrrolidin-1-yl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-(pyrrolidin-1-yl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-(dimethylamino)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-(dimethylamino)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-(dimethylamino)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-phenethylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((6-methoxypyridin-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-yl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,6-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-cyclopropylbenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-cyclopropylbenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-((3,4-trans)-1,4-dimethylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-cyclopropylbenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-(1H-pyrazol-1-yl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinolin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1,3-dimethyl-1H-pyrazol-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylpyrimidin-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylthiazol-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((6-methylpyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-methylpyrazin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-methylpyrazin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(3-(pyrrolidin-1-yl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((6-(trifluoromethyl)pyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-ethylpyrimidin-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-bromobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,4-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-bromobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3,5-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(3-(trifluoromethoxy)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-chloro-4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-bromobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4,4-difluorocyclohexyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chloro-3-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(4-(trifluoromethoxy)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluoro-3-(trifluoromethyl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,5-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3,5-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3,4-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-(4,4-difluorocyclohexyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4,4-difluorocyclohexyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((3aH-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4,4-difluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-(+)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorophenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(3-fluorophenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(4-(trifluoromethyl)pyrimidin-2-yl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2,2,2-trifluoroethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylpyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinolin-8-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((3-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylpyridin-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-propylpyrimidin-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-(pyrimidin-2-yl)ethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1,5-naphthyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1,8-naphthyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-(dimethylamino)pyrimidin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(cinnolin-3-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-(pyrimidin-5-yl)ethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((8-fluoroquinolin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(benzo[c][1,2,5]thiadiazol-5-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(thiazol-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(quinuclidin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1,3,5-triazin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-fluoro-5-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzonitrile; (+)-2-((3,4-trans)-1-((4,6-dimethylpyrimidin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chloropyrimidin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2,3-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-chloro-4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((4-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((6-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrido[2,3-d]pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(pyrido[3,2-b]pyrazin-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-tert-butyl 4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)piperidine-1-carboxylate; (+)-2-((3,4-trans)-1-((1,2,4-oxadiazol-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((4,4-difluorocyclohexyl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chlorofuran-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chlorofuran-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chlorothiophen-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chlorothiophen-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one (+)-2-((3,4-trans)-1-(cyclopentylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(cyclopropylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(furan-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(furan-3-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methylpiperidin-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((tetrahydro-2H-pyran-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(piperidin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(thiophen-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(thiophen-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-methoxypyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-methoxypyrimidin-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((4-methoxypyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-chloropyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-fluoropyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-methoxypyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-methoxypyridin-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-chloro-5-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chloro-3-(trifluoromethyl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(4-chloro-3-methylbenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(5-chloro-2-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((6-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(2-(trifluoromethoxy)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((2-methoxypyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((5-methoxypyridin-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-chloro-3,6-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(2-chloro-6-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(3-chloro-5-(trifluoromethyl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((3-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((4-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((6-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-N,N-dimethyl-2-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (+)-N,N-dimethyl-3-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (+)-N,N-dimethyl-4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (+)-2-((3,4-trans)-1-((1,2,4-oxadiazol-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-((1,3,4-oxadiazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-1-(biphenyl-4-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-1,2,4-triazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((2-methylthiazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-methyl-1,2,4-oxadiazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-((5-methyl-1H-1,2,4-triazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(4-(pyridin-4-yl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (+)-2-((3,4-trans)-4-methyl-1-(oxazol-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((3 aH-benzo [d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4,4-difluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,4-difluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo [d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(5-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-(−)-7-(5-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorocyclohexyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorocyclohexyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorophenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(3-fluorophenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(3-fluorophenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(3-fluorophenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-o-tolylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4,5-difluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4,5-difluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-phenylimidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one (−)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-benzyl-4-methylpyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one (−)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one (−)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(4-(trifluoromethyl)phenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1H-benzo[d]imidazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-([1,2,4]triazolo[1,5-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(4-fluoro-2-methylphenyl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(4-fluorobenzyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-1-(imidazo[1,2-a]pyridin-2-ylmethyl)-4-methylpyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyrazin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-2-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-7-(4-fluoro-2-methylphenyl)-2-((3,4-trans)-4-methyl-1-(pyridin-3-ylmethyl)pyrrolidin-3-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(4-(trifluoromethyl)pyrimidin-2-yl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(2,2,2-trifluoroethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((2-methylpyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(quinolin-8-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((3-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((2-methylpyridin-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((2-propylpyrimidin-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(2-(pyrimidin-2-yl)ethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1,5-naphthyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1,8-naphthyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((2-(dimethylamino)pyrimidin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(cinnolin-3-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((4,5,6,7-tetrahydropyrazolo [1,5-a]pyridin-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(2-(pyrimidin-5-yl)ethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((8-fluoroquinolin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(benzo[c][1,2,5]thiadiazol-5-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-pyrazol-5-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(thiazol-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(quinuclidin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1,3,5-triazin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-fluoro-5-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzonitrile; (−)-2-((3,4-trans)-1-((4,6-dimethylpyrimidin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chloropyrimidin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2,3-dichlorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(3-chloro-4-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((4-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((6-methylpyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrido[2,3-d]pyrimidin-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(pyrido[3,2-b]pyrazin-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-tert-butyl 4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)piperidine-1-carboxylate; (−)-2-((3,4-trans)-1-((1,2,4-oxadiazol-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((4,4-difluorocyclohexyl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chlorofuran-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chlorofuran-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chlorothiophen-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chlorothiophen-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(cyclopentylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(cyclopropylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(furan-2-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(furan-3-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methylpiperidin-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((tetrahydro-2H-pyran-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(piperidin-4-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(thiophen-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(thiophen-3-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((2-methoxypyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((2-methoxypyrimidin-5-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((4-methoxypyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-chloropyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-fluoropyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-methoxypyridin-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-methoxypyridin-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-chloro-5-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chloro-3-(trifluoromethyl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(4-chloro-3-methylbenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(5-chloro-2-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((6-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(2-(trifluoromethoxy)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((2-methoxypyridin-4-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((5-methoxypyridin-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-chloro-3,6-difluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(2-chloro-6-fluorobenzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(3-chloro-5-(trifluoromethyl)benzyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((3-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((4-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((6-(trifluoromethyl)pyridin-2-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-N,N-dimethyl-2-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (−)-N,N-dimethyl-3-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (−)-N,N-dimethyl-4-(((3,4-trans)-3-methyl-4-(4-oxo-7-(tetrahydro-2H-pyran-4-yl)-3,4-dihydroimidazo[1,5-f][1,2,4]triazin-2-yl)pyrrolidin-1-yl)methyl)benzamide; (−)-2-((3,4-trans)-1-((1,2,4-oxadiazol-3-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-((1,3,4-oxadiazol-2-yl)methyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-1-(biphenyl-4-ylmethyl)-4-methylpyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-1,2,4-triazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((1-methyl-1H-imidazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((2-methylthiazol-4-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((5-methyl-1,2,4-oxadiazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-((5-methyl-1H-1,2,4-triazol-3-yl)methyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; (−)-2-((3,4-trans)-4-methyl-1-(4-(pyridin-4-yl)benzyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; and (−)-2-((3,4-trans)-4-methyl-1-(oxazol-2-ylmethyl)pyrrolidin-3-yl)-7-(tetrahydro-2H-pyran-4-yl)imidazo[1,5-f][1,2,4]triazin-4(3H)-one; or a pharmaceutically acceptable salt thereof.