Catalytic asymmetric <i>de novo</i> construction of 4-pyrrolin-2-ones <i>via</i> intermolecular formal [3+2] cycloaddition of azoalkenes with azlactones
作者:Nan-Nan Mo、Yu-Hang Miao、Xiao Xiao、Yuan-Zhao Hua、Min-Can Wang、Lihua Huang、Guang-Jian Mei
DOI:10.1039/d3cc01194a
日期:——
The chiral phosphoric acid-catalyzed asymmetric intermolecular formal [3+2] cycloaddition of azoalkenes with azlactones has been established. This convergent protocol leads to a facile and enantioselective de novo construction of a wide range of fully substituted 4-pyrrolin-2-ones bearing a fully substituted carbon atom in good yields and with excellent enantioselectivities (26 examples, 72–95% yields
Catalytic asymmetric interrupted Attanasi reaction: access to fused 2,3-dihydropyrroles with vicinal quaternary carbons
作者:Yun-Xuan Chen、Tian-Jiao Han、Xiao Xiao、Min-Can Wang、Guang-Jian Mei
DOI:10.1039/d3cc02172f
日期:——
The first catalyticasymmetric interrupted Attanasi reaction has been established. Under the catalysis of a bifunctional organocatalyst, the condensation of cyclic β-keto esters with azoalkenes readily occurred, delivering a variety of bicyclic fused 2,3-dihydropyrroles with vicinal quaternary stereogenic centers in good yields and with good to excellent enantioselectivities (27 examples, up to 96%