Highly diastereoselective monoalkylation and Michael addition of N-(diphenylmethylene)glycinesultam under solid–liquid phase-transfer catalysis conditions using potassium carbonate as base
摘要:
Treatment of a sultam-derived N-(diphenylmethylene)glycinate equivalent 1 with activated (allylic and propargylic) organic bromides and with Michael accepters under solid-liquid phase-transfer catalysis conditions, using potassium carbonate as base, affords the monoalkylated compounds with high diastereoselectivity (>97% d.e.). (C) 1998 Elsevier Science Ltd. All rights reserved.
N-(Boc)-L-(2-Bromoallyl)-glycine: A versatile intermediate for the synthesis of optically active unnatural amino acids
作者:M.Robert Leanna、Howard E. Morton
DOI:10.1016/0040-4039(93)88065-q
日期:1993.7
synthesized from diethylacetamidomalonate and 2,3-dibromopropene in a one-pot procedure (75 % overall yield). The enantiomers were efficiently separated via a tandembiocatalytickinetic hydrolytic resolution. 1 was elaborated to several other interesting unnatural amino acid.
Highly diastereoselective monoalkylation and Michael addition of N-(diphenylmethylene)glycinesultam under solid–liquid phase-transfer catalysis conditions using potassium carbonate as base
作者:Anna López、Roser Pleixats
DOI:10.1016/s0957-4166(98)00169-4
日期:1998.6
Treatment of a sultam-derived N-(diphenylmethylene)glycinate equivalent 1 with activated (allylic and propargylic) organic bromides and with Michael accepters under solid-liquid phase-transfer catalysis conditions, using potassium carbonate as base, affords the monoalkylated compounds with high diastereoselectivity (>97% d.e.). (C) 1998 Elsevier Science Ltd. All rights reserved.