method with CDMT enabled the sequential transformation of gramines: substitution with (N-alkylidene)aminomalonates followed by the Pictet–Spengler reaction under acidic conditions afforded 1,2,3,4-tetrahydro-β-carboline derivatives in one pot.
One-Pot, Three-Component, Highly
Diastereoselective Metal-Free Synthesis of 2,3,4,5-Tetrasubstituted
Pyrrolidines
作者:Ramon Rios、Luis Crovetto
DOI:10.1055/s-2008-1078566
日期:——
An extremely efficient, highly diastereoselective, metal-freesynthesis of 2,3,4,5-tetrasubstituted pyrrolidines is described. The three-component reaction between aldehydes, aminomalonates, and nitroalkenes proceeds with high diastereoselectivities and high yields.
Diastereoselective trifunctionalization of pyridinium salts to access structurally crowded azaheteropolycycles
作者:Zhaohui Cui、Kuan Zhang、Lijie Gu、Zhanwei Bu、Junwei Zhao、Qilin Wang
DOI:10.1039/d1cc03478b
日期:——
A highly diastereoselective dearomative trifunctionalization of pyridinium salts with multifunctional o-hydroxy aromatic azomethine ylides has been established to assemble challenging and architecturally crowded fused pentacycles.
A chiral thiourea catalyst possessing an amine function catalyzes an asymmetric [3+2] cycloaddition of azomethineylides to nitroolefins to provide highly functionalized pyrrolidines with high diastereo- and enantioselectivities (up to 98:1:1 dr, 92% ee). The reaction proceeds in a stepwise manner consisting of Michael addition and subsequent intramolecular aza-Henry reaction. Both reactions are promoted
Catalytic chemoselective [3+3] cycloadditions of azomethine ylides with quinone monoimides leading to the construction of a dihydrobenzoxazine scaffold
作者:Cong-Shuai Wang、Ren-Yi Zhu、Yu-Chen Zhang、Feng Shi
DOI:10.1039/c5cc03341a
日期:——
A chemoselective [3+3] cycloaddition of in situ generated azomethine ylides with quinone monoimides has been established, which efficiently led to the construction of dihydrobenzoxazine frameworks with biological relevance.