Gold(I)‐Catalyzed Highly Diastereo‐ and Enantioselective Cyclization–[4+3] Annulation Cascades between 2‐(1‐Alkynyl)‐2‐alken‐1‐ones and Anthranils
作者:Rahul Dadabhau Kardile、Tzu‐Hsuan Chao、Mu‐Jeng Cheng、Rai‐Shung Liu
DOI:10.1002/anie.202001854
日期:2020.6.22
This work reports gold‐catalyzed [4+3]‐annulations of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with anthranils to yield epoxybenzoazepine products with excellent exo ‐diastereoselectivity (dr>25:1). The utility of this new gold catalysis is manifested by applicable substrates over a broad scope. More importantly, the enantioselective versions of these [4+3]‐cycloadditions have been developed satisfactorily with
Organocatalytic Enantioselective Formal [4 + 2] Cycloaddition of Enones with Cyclic <i>N</i>-Sulfonylimines and Methylene Chromene for Chiral Spirocyclic Compounds
作者:Jie Fei、Qingqing Qian、Xiaohua Sun、Xiaodong Gu、Chuncheng Zou、Jinxing Ye
DOI:10.1021/acs.orglett.5b02667
日期:2015.11.6
A highly enantioselective synthesis of spirocycles and bridged rings has been developed through a formal [4 + 2] cycloadditionreaction between enones and N-sulfonylimines. The unprecedented strategy has been realized utilizing N-sulfonylimine as a novel dienophile through enamine–iminium tautomerism of N-sulfonylimine. In addition, a γ,ε-regioselective cycloadditionreaction proceeded by employing
Synthesis of New Phosphonoamide and Phosphonocaprolactam Derivatives via the Diethyl Chlorophosphate-Promoted Beckmann Rearrangement of γ-Phosphonyloximes
作者:Aymen Wahbi、Soufiane Touil
DOI:10.1002/hc.21273
日期:2015.11
Herein, we report an efficient and straightforward synthesis of new phosphonoamide and phosphonocaprolactam derivatives, via the Beckmann rearrangement of γ-phosphonyloximes. The reaction proceeded smoothly in the presence of diethyl chlorophosphate as a promoter, to afford the title compounds in satisfactory yields. A mechanistic rationalization for this reaction is provided allowing for the prediction
The compound represented by formula (1):
wherein
R
4
and R
5
each represents a hydrogen atom, a halogen atom, or a C1-C3 alkyl group; R
6
represents a C1-C4 alkyl group, a C3-C6 cycloalkyl group, or the like; R
7
, R
8
, and R
9
each represents a hydrogen atom, a halogen atom, or the like; R
10
represents a C1-C3 alkyl group, or the like; R
13
represents a C1-C3 alkyl group, or the like; and Q represents a phenyl group, or the like;
has an excellent control effect on pests.
Synthesis of 3,4,5-trisubstituted phenols <i>via</i> Rh(<scp>iii</scp>)-catalyzed alkenyl C–H activation assisted by phosphonium cations
作者:Yan Mao、Wenxi Chen、Changchang Li、Lin Miao、Yanfei Lin、Fei Ling、Zhangpei Chen、Jinzhong Yao
DOI:10.1039/d3cc00017f
日期:——
construction of various 3,4,5-trisubstituted phenol derivatives has been achieved via the Rh(III)-catalyzed coupling of phosphoniumcations with internal alkynes. This protocol shows good substrate compatibility, as an array of structurally and electronically diverse phosphonium compounds react efficiently with up to 87% yield.
通过Rh( III ) 催化的鏻阳离子与内部炔烃的偶联,实现了构建各种 3,4,5-三取代苯酚衍生物的有效方法。该协议显示出良好的底物兼容性,因为一系列结构和电子不同的磷化合物有效反应,产率高达 87%。