A<i>N,N′</i>-Dioxide-Copper(II) Complex as an Efficient Catalyst for the Enantioselective and Diastereoselective Mannich-Type Reaction of Glycine Schiff Bases with Aldimines
A highly diastereo‐ and enantioselective Mannich‐type reaction of glycine Schiff base 1 has been developed by using the N,N′‐dioxide L‐CuII complex as a catalyst. Various optically active anti‐α,β‐diamino acid esters were obtained in good yields with up to 96:4 d.r. and 97 % ee. This straightforward method features a low catalyst loading and mild reaction conditions.
温和的举止!通过使用N,N'-二氧化物L- Cu II配合物作为催化剂,开发了甘氨酸Schiff碱1的高度非对映和对映选择性曼尼希型反应。以高达96:4 dr和97%ee的高收率获得了各种光学活性的抗α,β-二氨基酸酯 。这种简单的方法具有催化剂负载低和反应条件温和的特点。
Catalytic enantioselective addition of terminal 1,3-diynes to N-sulfonyl aldimines: access to chiral diynylated carbinamines
作者:Tian-Lin Liu、Heng-Xia Zhang、Yan Zheng、Qingwei Yao、Jun-An Ma
DOI:10.1039/c2cc37290h
日期:——
An efficient method for the asymmetric synthesis of chiral diynylated carbinamines is described. The direct catalytic enantioselective addition of terminal 1,3-diynes to N-sulfonyl aldimines proceeded smoothly under mild reaction conditions to produce diynylated carbinamines in up to 98% yield and 99% ee.
Enantioselective and Rapid Rh-Catalyzed Arylation of <i>N</i>-Tosyl- and <i>N</i>-Nosylaldimines in Methanol
作者:Chun-Chih Chen、Balraj Gopula、Jin-Fong Syu、Jhih-Han Pan、Ting-Shen Kuo、Ping-Yu Wu、Julian P. Henschke、Hsyueh-Liang Wu
DOI:10.1021/jo5012653
日期:2014.9.5
Enantiomericallyenriched tosyl-protected diarylmethylamines were rapidly prepared by the asymmetricaddition of arylboronic acids to N-tosylaldimines under mild conditions in the presence of a catalyst prepared in situ from Rh(I) and a chiral diene ligand. This methodology offers access to diarylmethylamines in good yields with excellent chiral purity at room temperature using MeOH as a solvent and
NHC-Mediated Stetter-Aldol and Imino-Stetter-Aldol Domino Cyclization to Naphthalen-1(2<i>H</i>)-ones and Isoquinolines
作者:Debabrata Barman、Tanmoy Ghosh、Krishanu Show、Sudipto Debnath、Tapas Ghosh、Dilip K. Maiti
DOI:10.1021/acs.orglett.1c00337
日期:2021.3.19
N-Heterocyclic carbene-catalyzed tandem Stetter-aldol reaction of phthalaldehyde and α,β-unsaturated ketimines has been developed to afford functionalized naphthalen-1(2H)-one derivatives as the formal [4+2] annulation product. Interestingly, the reaction of aldimines led to the formation of isoquinoline derivatives instead of the expected indanone derivatives as a [4+1] annulation product.
Asymmetric Enynylation of<i>N</i>-Sulfonyl Aldimines Catalyzed by Zn-BINOL Complexes
作者:Zhen-Yan Yang、Tian-Lin Liu、Yan Zheng、Shen Li、Jun-An Ma
DOI:10.1002/ejoc.201500400
日期:2015.6
An efficient enynylation of N-sulfonyl aldimines is described herein. In the presence of Zn-BINOLcomplexes, catalytic enantioselective addition reactions of terminal 3-en-1-ynes to N-sulfonyl aldimines proceed smoothly to produce enynylated carbinamines in up to 96 % yield and 95 % ee. The adducts are versatile synthetic intermediates that readily undergo Pauson–Khand cycloaddition reactions to give