Bismuth triflate was found to be an efficient catalyst in the Mannich-typereaction of silylenolates with N-alkoxycarbonylamino sulfones. The reaction proceeded smoothly with a low catalyst loading of bismuth triflate (0.5–1.0 mol %) to afford the corresponding protected β-aminocarbonyl compound in very good yields (up to 96 %).
[EN] RACEMIC PREPARATION METHOD FOR CHIRAL β-AMINO ACID AND DERIVATIVE THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION RACÉMIQUE POUR UN ACIDE β-AMINÉ CHIRAL ET UN DÉRIVÉ DE CE DERNIER<br/>[ZH] 一种手性β-氨基酸及其衍生物的消旋制备方法
申请人:ZHEJIANG JIUZHOU PHARM CO LTD
公开号:WO2021017645A1
公开(公告)日:2021-02-04
本发明属于医药合成领域,涉及制备手性β-氨基酸及其衍生物的消旋制备方法,特别是涉及一种西格列汀中间体的消旋方法。(I), (II) 其中,R1为氢、烷基或芳基;R2为氢、烷基或芳基;R3为氢、烷基、芳基或酰基;R4为烷基、芳基、OR'、SR'、NHR'或NR'R"。其中R',R"为氢、烷基或芳基。
Brienne,M.-J. et al., Bulletin de la Societe Chimique de France, 1969, p. 2395 - 2407
作者:Brienne,M.-J. et al.
DOI:——
日期:——
McKenzie; Barrow, Journal of the Chemical Society, 1921, vol. 119, p. 72