Two-fold amino acid-based chiral aminophosphine–oxazolines and use in asymmetric allylic alkylation
摘要:
Chiral aminophosphine-oxazoline ligands derived from two different amino acids (tetrahydroisoquinoline carboxylic acid and proline) have been synthesized and examined as chiral auxiliaries in asymmetric allylic alkylation of three substrates. Stereoisomers la and 2a are providing the highest enantio selectivities (up to 94% ee) in the allylation of diphenylpropenyl acetate. (C) 2003 Elsevier Ltd. All rights reserved.
Two-fold amino acid-based chiral aminophosphine–oxazolines and use in asymmetric allylic alkylation
摘要:
Chiral aminophosphine-oxazoline ligands derived from two different amino acids (tetrahydroisoquinoline carboxylic acid and proline) have been synthesized and examined as chiral auxiliaries in asymmetric allylic alkylation of three substrates. Stereoisomers la and 2a are providing the highest enantio selectivities (up to 94% ee) in the allylation of diphenylpropenyl acetate. (C) 2003 Elsevier Ltd. All rights reserved.
A Proline-Based Phosphine Template for Staudinger Ligation
作者:Chung-Min Park、Wei Niu、Chunrong Liu、Tyler D. Biggs、Jiantao Guo、Ming Xian
DOI:10.1021/ol3022484
日期:2012.9.7
A proline-based phosphine template enabling a rapid Staudinger ligation of azide-containing substrates under mild conditions is reported. This reaction has a second-order rate constant of 1.12 M-1 s(-1). It is expected that the proline-based Staudinger ligation strategy will be a useful method for bioconjugation and proline based peptide coupling.