Spontaneous rearrangement of heteroaromatic alkynols into enones involves an autocatalytic mechanism.
杂芳族炔醇自发重排成烯酮涉及一种自催化机制。
Cinchona alkaloid derived squaramide catalyzed diastereo- and enantioselective Michael addition of isocyanoacetates to 2-enoylpyridines
作者:Mei-Xin Zhao、Guang-Yu Zhu、Xiao-Li Zhao、Min Shi
DOI:10.1016/j.tet.2019.01.024
日期:2019.3
An efficient organocatalytic diastereo- and enantioselective Michael addition of α-substituted isocyanoacetates to 2-enoylpyridines catalyzed by cinchona alkaloid-derived squaramide has been achieved, affording the corresponding adducts with two adjacent tertiary-quaternary stereocenters in excellent yields (up to 99%) and good to excellent stereoselectivities (up to >20:1 dr, up to 98% ee) under mild