Synthesis of α-alkylidene-γ-lactones by intramolecular addition of alkoxycarbonyl free-radicals to acetylenes
作者:Mario D. Bachi、Eric Bosch
DOI:10.1016/s0040-4039(00)84062-9
日期:1986.1
α-Alkylidene-γ-lactones are obtained by treatment of chloroformate and selenocarbonate derivatives of homopropargylic alcohols with tri-n-butylstannane.
α-亚炔基-γ-内酯是通过用三正丁基锡烷处理均丙醇的氯甲酸酯和硒代碳酸酯衍生物而获得的。
Construction of Vicinal Quaternary Stereogenic Centers by Enantioselective Direct Mannich-Type Reaction Using a Chiral Bis(guanidino)iminophosphorane Catalyst
作者:Tadahiro Takeda、Azusa Kondoh、Masahiro Terada
DOI:10.1002/anie.201601352
日期:2016.4.4
the chiral organosuperbase catalyst, the reaction afforded densely functionalized amino‐acid derivatives having vicinal quaternary stereogeniccenters, one of which is an all‐carbon quaternary stereogeniccenter, in good yield with high diastereo‐ and enantioselectivities.