Photoelectrochemical Asymmetric Catalysis Enables Enantioselective Heteroarylcyanation of Alkenes via C–H Functionalization
作者:Xiao-Li Lai、Hai-Chao Xu
DOI:10.1021/jacs.3c07146
日期:2023.8.30
group donors. In this context, we report herein a photoelectrocatalytic method for the enantioselective heteroarylcyanation of aryl alkenes, which employs unfunctionalized heteroarenes through C–H functionalization. The photoelectrochemical asymmetriccatalysis (PEAC) method combines photoredox catalysis and asymmetric electrocatalysis to facilitate the formation of two C–C bonds operating via hydrogen
Enantioselective addition of an imide N–H bond to alkenes was realized by use of a cationic iridium catalyst. Bulky diphosphine ligands such as DTBM-segphos, DTBM-MeO-biphep, and DTBM-binap were indispensable for the reaction. A variety of styrene derivatives, allylsilanes, and norbornene were good substrates to give the corresponding chiral adducts with high enantioselectivity.
Fused-ring carboxylic acid derivatives represented by general formula (A) and pharmacologically acceptable salts thereof, which can provide medicines excellent in retinoic acid receptor agonist activities, wherein the symbolrepresents a single or double bond; and each of X, Y, Z, P, Q, U, V and W represents -O-, -S- or a group represented by formula (a), wherein Rk (k:1-8) represents hydrogen, halogeno, optionally substituted lower alkyl, etc., and either R7 or R8 represents a group represented by formula (b), wherein rings A and B represent each independently an optionally substituted aromatic hydrocarbon or unsaturated heterocyclic ring; and D represents an optionally protected carboxyl group.
通式(A)代表的融合环羧酸衍生物及其药理学上可接受的盐,可提供维甲酸受体激动剂活性极佳的药物,其中符号代表单键或双键;X、Y、Z、P、Q、U、V 和 W 各自代表-O-、-S- 或式(a)代表的基团,其中 Rk (k:1-8) 代表氢、卤素、任选取代的低级烷基等、以及 R7 或 R8 代表由式(b)表示的基团,其中环 A 和 B 各自独立地代表任选取代的芳香烃或不饱和杂环;以及 D 代表任选保护的羧基。
A new facile method for the stereoselective synthesis of trans-2-aryl-3,3-dimethylcyclopropane-1-carboxylic acids
作者:Bang-Chi Chen、Khehyong Ngu、Peng Guo、Wen Liu、Joseph E Sundeen、David S Weinstein、Karnail S Atwal、Saleem Ahmad
DOI:10.1016/s0040-4039(01)01224-2
日期:2001.9
A new facile method for the preparation of trans-2-aryl-3,3-dimethylcyclopropane-1-carboxylic acids was developed. The new method involved [2+2]-cycloaddition of styrenes with NN,2-trimethylpropionamide followed by bromination and rearrangement of the resulting 3-aryl-2,2-dimethylcyclobutanones, affording the title compounds in two steps in 60-84% overall yields. (C) 2001 Elsevier Science Ltd. All rights reserved.