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
The reactions of phenolic reagents with α-bromo Michael acceptors in the K2CO3-acetone system. A stereospecific AdSNE process.
作者:Vittorio Rosnati、Antonio Saba、Aldo Salimbeni
DOI:10.1016/0040-4039(81)80178-5
日期:1981.1
α-bromo Michael acceptors undergo ipso-substitution by phenol or benzenethiol in the K2CO3-acetone system, the reaction originating the (Z) isomers, via a stereospecific AdSNE process.
α-溴Michael受体在K 2 CO 3-丙酮体系中通过苯酚或苯硫酚进行ipso取代,该反应通过立体特异性Ad SN E过程引发(Z)异构体。
Organocatalytic Formation of Chiral Trisubstituted Allenes and Chiral Furan Derivatives
作者:Pernille H. Poulsen、Yang Li、Vibeke H. Lauridsen、Danny K. B. Jørgensen、Teresa A. Palazzo、Marta Meazza、Karl Anker Jørgensen
DOI:10.1002/anie.201806238
日期:2018.8.13
by amino catalytic activation of either aldehydes or α,β‐unsaturated aldehydes for reaction with alkynyl‐substituted enones is presented. The reaction forms a variety of trisubstituted allenes in high yields and with excellent stereoselectivities. The utility of the reaction concept is demonstrated by the synthesis of chiral furan derivatives in high yields and stereoselectivities.