trans-Stereoselective Reduction of Hexahydroquinazoline-2(1H)-thione Derivatives
摘要:
Reduction of substituted 4-arylhexahydroquinazoline-2(1H)-thiones using NaBH4/CF3CO2H in chloroform gave the corresponding trans-fused octahydroquinazoline-2(1H)-thiones. The use of two reducing systems, NaBH4/CH3CO2H or NaBH4/CF3CO2H, permitted the consecutive trans-selective reduction of the endo- and exocyclic double bond in the case of 8-dithiomethylidene derivatives of hexahydroquinazoline-2(1H)-thiones.