Noncovalent Organocatalytic Synthesis of Enantioenriched Terminal Aziridines with a Quaternary Stereogenic Center
作者:Claudia De Fusco、Tiziana Fuoco、Gianluca Croce、Alessandra Lattanzi
DOI:10.1021/ol3017066
日期:2012.8.17
A high-yielding and enantioselective access to novel N-Boc terminal aziridines, bearing a quaternarystereogeniccenter, has been developed via an aza-Michael initiated ring-closure (aza-MIRC) reaction of α-acyl acrylates with an N-tosyloxy tert-butyl carbamate catalyzed by a chiral amino thiourea. The feasibility of the aziridine regioselective ring-opening to valuable α,α-disubstituted α-amino acid
The first one‐pot tandem Michael addition/enantioselective Conia‐ene cyclization of N‐protected prop‐2‐yn‐1‐amines with 2‐methylene‐3‐oxoalkanoates promoted by chiral iron(III)/silver(I) cooperative catalysts has been developed. Alkyl 4‐methylenepyrrolidine‐3‐acyl‐3‐carboxylates, which can be transformed into β‐proline derivatives, are obtained in high yield with high enantioselectivity.
Highly Chemoselective Rauhut–Currier Reaction between Maleimides and Enones and Dual Phosphine-Mediated One-Pot Synthesis of Bicyclic and Polycyclic Skeletons
作者:Rong Zhou、Jianfang Wang、Jia Yu、Zhengjie He
DOI:10.1021/jo401363u
日期:2013.11.1
A highly chemoselective phosphine-catalyzed Rauhut–Currierreaction between maleimides and enones has been realized under very mild conditions, affording the corresponding cross-coupling products in moderate to excellent yields. On the basis of this reaction, an efficient dual phosphine-mediated one-pot synthesis of bicyclic and polycyclic compounds containing a cyclopenta[c]pyrrole skeleton has been
在非常温和的条件下已实现了高度化学选择性的膦催化的马来酰亚胺和烯酮之间的Rauhut-Currier反应,从而以中等至极好的收率提供了相应的交叉偶联产物。在此反应的基础上,据此开发了一种有效的双膦介导的一锅合成含环戊五烯[ c ]吡咯骨架的双环和多环化合物的方法,其特征是分子间Rauhut-Currier反应和分子内Wittig反应的串联序列。
Electron-Donor–Acceptor Complex-Enabled Flow Methodology for the Hydrotrifluoromethylation of Unsaturated β-Keto Esters
作者:Gabriel M. F. Batista、Pedro P. de Castro、Hélio F. Dos Santos、Kleber T. de Oliveira、Giovanni W. Amarante
DOI:10.1021/acs.orglett.0c03187
日期:2020.11.6
(EDA) complex-enabled flow photochemical hydrotrifluoromethylation of unsaturated β-keto esters is described. The developed protocol has an easy experimental procedure and does not require the use of transition-metal-based photocatalysts, allowing the isolation of 14 new compounds in up to 86% yield. Control experiments and computational studies revealed that the reaction proceeds through a Michael-type
Diethyl phosphite mediated reductive [1 + 4] annulation of α-ketoesters with α, β-unsaturated ketones and synthesis of polysubstituted 2,3-dihydrofurans
作者:Feixue Xue、Xiangyu Chen、Zhengjie He
DOI:10.1016/j.tet.2022.132646
日期:2022.1
A diethyl phosphite mediated reductive [1 + 4] annulation of α-ketoesters with α, β-unsaturatedketones has been developed, which provides an effective and simple method to prepare polysubstituted 2,3-dihydrofurans bearing a quaternary carbon center in fair to excellent yields. In the reaction, the in situ generated [1,2]-phospha-Brook rearrangement adduct of phosphite and α-ketoester presumably serves