The asymmetric synthesis of (R)-(+)- and (S)-(−)-O-methylbharatamine
作者:Maria Chrzanowska、Agnieszka Dreas
DOI:10.1016/j.tetasy.2004.06.038
日期:2004.8
The asymmetric syntheses of (R)-(+)- and (S)-(−)-O-methylbharatamine were performed using the lateral metallation strategy, in which (R)- and (S)-phenylalaninol were applied as chiral auxiliaries. The addition reaction of chiral o-toluamide carbanion to 6,7-dimethoxy-3,4-dihydroisoquinoline proceeded with a simultaneous cyclization reaction, giving both enantiomers of 2,3-dimethoxy-8-oxoberbine in