Synthesis of protected α-amino acids <i>via</i> decarboxylation amination from malonate derivatives
作者:Hui Fu、Peihe Li、Zheng Wang、Xiaoying Li、Qipu Dai、Changwen Hu
DOI:10.1039/d0ob00677g
日期:——
A general and efficient strategy for the synthesis of protected α-aminoacids is reported. The method uses malonate derivatives as the starting materials and Cs2CO3 as a base at 60 degrees, giving α-aminoacidderivatives in moderate yields by releasing CO2. This methodology shows broad substrate scope (primary and secondary acids), excellent functional group tolerance and high efficiency to give the
报道了一种合成保护的α-氨基酸的通用有效策略。该方法以丙二酸酯衍生物为起始原料,以Cs 2 CO 3为碱在60度下,通过释放CO 2,以中等收率得到α-氨基酸衍生物。该方法学显示了广泛的底物范围(伯酸和仲酸),出色的官能团耐受性和高效率,可在温和的反应条件下提供所需的产物。它还允许构建β和γ-氨基酸以及其他非天然产物。
Alkali Base-Initiated Michael Addition/Alkyne Carbocyclization Cascades
作者:Christopher Kourra、Felix Klotter、Filippo Sladojevich、Darren J. Dixon
DOI:10.1021/ol2033674
日期:2012.2.17
A new cascade reaction involving an intramolecular Michael addition followed by an alkyne carbocyclization is presented. The reaction is promoted by a substoichiometric amount of KHMDS and represents one of the rare examples where the carbocyclization of an unactivatedalkyne is mediated by an alkali metal base, under mild conditions. The reaction allows the generation of functionally dense, stereochemically