Cobalt-catalyzed annulation of styrenes with α-bromoacetic acids
作者:Tung T. Nguyen、Bao H. T. Ngo、Huy X. Le、Linh N. P. Vu、Tuong A. To、Anh N. Q. Phan、Nam T. S. Phan
DOI:10.1039/d0ra09588e
日期:——
We report a method for addition of α-bromophenylacetic acids to vinyl CC bonds in styrenes to afford γ-lactones. Reactions employed a simple cobalt catalyst Co(NO3)2·6H2O in the presence of dipivaloylmethane (dpm) ligand. Many functionalities including halogen, ester, and nitro groups were compatible with reaction conditions. If α-bromoesters were used, vinylacetates were the major products.
我们报告了一种将 α-溴苯乙酸添加到苯乙烯中的乙烯基 C C 键以提供 γ-内酯的方法。在二戊酰甲烷 (dpm) 配体存在下,反应使用简单的钴催化剂 Co(NO 3 ) 2 ·6H 2 O。许多官能团,包括卤素、酯和硝基,都与反应条件相容。如果使用 α-溴代酯,醋酸乙烯酯是主要产品。
A Novel Intermolecular Synthesis of γ-Lactones via Visible-Light Photoredox Catalysis
作者:Xiao-Jing Wei、Deng-Tao Yang、Lin Wang、Tao Song、Li-Zhu Wu、Qiang Liu
DOI:10.1021/ol402954t
日期:2013.12.6
Direct gamma-lactone formation via visible-light photoredox catalysis has been achieved efficiently including hydroxylalkylation of aromatic alkenes and transesterification. The present photocatalytic protocol has good regioselectivity and substrate compatibility, affording a novel way to intermolecular gamma-lactone synthesis by the reaction of styrenes with alpha-bromo esters in the absence of any external oxidants.
324. Grignard reactions with phthalic anhydrides
作者:Chaim Weizmann、Ernst Bergmann、Felix Bergmann
DOI:10.1039/jr9350001367
日期:——
Akhnookh et al., Journal of the Chemical Society, 1959, p. 1013,1015