Highly Selective Synthesis of Enantiopure (S,E)-α,β-Unsaturated γ-Amino Esters Through a Sequential Reaction of Ethyl Dibromoacetate with α-Amino Aldehydes Promoted by Chromium Dichloride
作者:José M. Concellón、Carmen Méjica
DOI:10.1002/ejoc.200700515
日期:2007.11
A sequential reaction of ethyl dibromoacetate with various enantiopure N,N-dibenzyl- or N-Boc-α-amino aldehydes (derived from natural α-amino acids), promoted by chromium dichloride, afforded optically active (S,E)-α,β-unsaturated γ-amino esters. The C=C double bond was generated with total or very high E-selectivity and the (S,E)-α,β-unsaturated γ-amino esters were obtained with complete enantiomeric
二溴乙酸乙酯与各种对映体纯 N,N-二苄基-或 N-Boc-α-氨基醛(源自天然α-氨基酸)在二氯化铬的促进下进行顺序反应,得到旋光(S,E)-α, β-不饱和γ-氨基酯。C=C 双键以完全或非常高的 E-选择性生成,并且 (S,E)-α,β-不饱和 γ-氨基酯以完全对映体纯度获得,除了 N-Boc-苯丙醛(如测定通过手性 HPLC)。提出了一种机制来解释这种转变。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)