Patent ID: 7632946
Filing Date: 2009-12-15
Classification: C07D

Abstract:
1. A compound having the formula (I) or salt thereof: in which R 1 is —OH, or O—R 9 , NH 2 , or N—R 9 ; R 2 is H, allyloxy, 2,4-dimethoxybenzyl, 2-cyanoethyl, 4-methoxybenzyl, trimethylsilyl, tert-butyl, and triphenylmethyl; R 3 and R 4 combine to form (CH 2 )n with n=1, 2, 3; R 5 -R 8 is H; R 9 is C 1 -alkyl, C 2 -alkyl, C 3 -alkyl, C 4 -alkyl, C 5 -alkyl, or C 6 -alkyl; and X 1 is O, NH, and N-unsubstituted alkyl.