| abstract |
alpha -Substituted lactones of formula (I) (except for 3-benzyl-3-methyl-tetrahydropyran-2-one, 3-benzyl-3-methyl-dihydrofuran-2-one and 3,3-dibenzyl-dihydrofuran-2-one) and their salts are new. R1 = H, 1-6C acyl, 2-6C alkenyl, 3-7C cycloalkenyl or 1-6C alkyl (optionally substituted by 6-10C aryl or CN); R2 = (6-10C)aryl(1-6C)alkyl or (6-10C)aryl(2-6C)alkenyl (optionally ring-substituted by halogen, CF3, CN, 1-6C alkoxy, 2-7C alkoxycarbonyl, Ar, OAr, COAr, 1-6C alkyl, carboxy(1-6C)alkyl and/or (2-7C)alkoxycarbonyl(1-6C)alkyl) or 5-indanylmethyl or 1,3-dioxa-5-indanylmethyl; Ar = optionally halogenated phenyl; and a = 1 or 2. |