Asymmetric Synthesis of a-Substituted 5-Hydroxytryptophan Derivatives
摘要:
5-hydroxytryptophan was converted to pyrroloindole (3), which on deprotonation with LDA and subsequent reaction with alkyl halides gave the C-2 alkylated derivatives (6-9) cleanly with retention of configuration. Reversion to the 5-hydroxytryptophan skeleton was then achieved by stirring in trifluoroacetic acid and deprotection by treatment with sodium in liquid ammonia followed by saponification.
Asymmetric Synthesis of a-Substituted 5-Hydroxytryptophan Derivatives
摘要:
5-hydroxytryptophan was converted to pyrroloindole (3), which on deprotonation with LDA and subsequent reaction with alkyl halides gave the C-2 alkylated derivatives (6-9) cleanly with retention of configuration. Reversion to the 5-hydroxytryptophan skeleton was then achieved by stirring in trifluoroacetic acid and deprotection by treatment with sodium in liquid ammonia followed by saponification.