Patent ID: 8841305

Claim:
A compound of formula (Ia′) wherein R 1 and R 2 are as follows: R 1 and R 2 are 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 4-cyanophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 4-chlorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 4-fluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 3-fluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2-fluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2,6-difluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2,4,5-trifluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2,5-difluoro-3-propylphenyl and R 2 is 6-(2,3-dihydro-benzo [b][1,4]dioxinyl); R 1 is 2,6-difluoro-3-hydroxyphenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2,4-difluorophenyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 3-(trifluoromethylphenyl) and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2-pyridyl and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2-pyridyl-1-oxide and R 2 is 6-(2,3-dihydro-benzo[b][1,4]dioxinyl); R 1 is 2,6-difluorophenyl and R 2 is 2,6-difluorophenyl; R 1 is 2,6-difluorophenyl and R 2 is 7-(3,4-dihydro-2H-benzo[b][1,4]dioxepinyl); R 1 is 2,6-difluorophenyl and R 2 is 5-benzo[d][1,4]dioxinyl; R 1 is 2,6-difluorophenyl and R 2 is 7-(4-methyl-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazinyl); R 1 is 2,6-difluorophenyl and R 2 is 2-naphthalenyl; R 1 is 2,6-difluorophenyl and R 2 is 6-(2,2-dimethylchromanyl); R 1 is 2,6-difluorophenyl and R 2 is 5-(1-methyl-1H-indolyl); or R 1 is 2,6-difluorophenyl and R 2 is 6-(2-methylbenzo[d]thiazolyl).