Homochiral syntheses of (–)-dihydrocorynantheol

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).

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