Homochiral syntheses of (–)-dihydrocorynantheol
Abstract
A Corynanthe-type indole alkaloid, (–)-dihydrocorynantheol (7), was enantioselectively synthesized from (+)-(4S,5R)-4-(2-benzyloxyethyl)-5-ethyl-3,4,5,6-tetrahydro-2-pyrone (3), derived from ethylmalonic acid. The synthetic compound (7) was identical in all respects with a sample prepared from yohimbine (8).