摘要:
The protoberberine-type alkaloid, (S)-(-)-O-methylbharatamine, has been synthesized in six steps involving the addition of laterally lithiated o-toluamide to (S)-N-tert-butanesulfinimine as the crucial process. The target alkaloid was obtained in 24.4% overall yield with 88% ee. (c) 2007 Elsevier Ltd. All rights reserved.