Theoretical Evidence for Pyramidalized Bicyclic Serine Enolates in Highly Diastereoselective Alkylations
作者:Carlos Aydillo、Gonzalo Jiménez-Osés、Jesús H. Busto、Jesús M. Peregrina、María M. Zurbano、Alberto Avenoza
DOI:10.1002/chem.200601746
日期:2007.6.4
and its enantiomer have been synthesized from (S)- and (R)-N-Boc-serine methyl esters (Boc: tert-butyloxycarbonyl). The use of these compounds as chiral building blocks has been demonstrated in the synthesis of alpha-alkyl alpha-amino acids by diastereoselective potassium enolate alkylation reactions and subsequent acid hydrolyses. Theoretical studies were performed to elucidate the stereochemical
由(S)-和(R)-N-Boc-丝氨酸甲酯(Boc:叔丁氧羰基)合成了新的手性丝氨酸当量及其对映异构体。在通过非对映选择性烯醇酸钾烷基化反应和随后的酸水解合成α-烷基α-氨基酸中,已证明将这些化合物用作手性结构单元。进行了理论研究,以阐明五元环状N,O-乙缩醛的形成和随后的烷基化过程(完全保留构型而发生)的立体化学结果。该特征可以用烯醇盐中间体的高度锥体化来解释。