<i>N</i>-Fluorobenzenesulfonimide as Catalyst for the Three-Component Synthesis of Isoquinuclidines
作者:D. Wu、Y-H. He、X. Deng、Z. Guan
DOI:10.1002/jhet.1544
日期:2013.3
N‐Fluorobenzenesulfonimide was used for the first time as a catalyst to carry out the three‐component synthesis of isoquinuclidines with the use of various cyclohexenone (1), benzaldehydes (2), and anilines (3). The yields up to 80% and the endo/exo stereoselectivity ratios up to 19:81 were achieved.
Enzyme-Catalyzed Direct Three-Component Aza-Diels–Alder Reaction Using Hen Egg White Lysozyme
作者:Yan-Hong He、Wen Hu、Zhi Guan
DOI:10.1021/jo2016696
日期:2012.1.6
The direct three-component aza-Diels-Alder reaction of aromatic aldehyde, aromatic amine, and 2-cyclohexen-1-one was catalyzed by hen egg white lysozyme for the first time. Under the optimized conditions investigated in this paper, the enzyme-catalyzed aza-Diels-Alder reaction gave yields up to 98% and stereoselectivity of endo/exo ratios up to 90:10.
Enantioselective Direct Aza Hetero-Diels−Alder Reaction Catalyzed by Chiral Brønsted Acids
作者:Hua Liu、Lin-Feng Cun、Ai-Qiao Mi、Yao-Zhong Jiang、Liu-Zhu Gong
DOI:10.1021/ol062499t
日期:2006.12.1
The first chiral Bronsted acid-catalyzed asymmetric direct aza hetero-Diels-Alder reaction has been described. The phosphoric acids, prepared from binol and H-8-binol derivatives, have shown catalytic ability for the reaction of cyclohexenone with N-PMP-benzaldimine. A chiral phosphoric acid, derived from 3,3-di(4-chloropheneyl)-H-8-binol, exhibited superior enantioselectivity, affording fairly good yields and enantioselectivities for the reaction of a range of aromatic aldimines with cyclohexenone.