UV Light-Mediated Difunctionalization of Alkenes through Aroyl Radical Addition/1,4-/1,2-Aryl Shift Cascade Reactions
摘要:
UV light-mediated difunctionalization of alkenes through an aroyl radical addition/1,4-/1,2-aryl shift has been described. The resulted aroyl radical from a photocleavage reaction added to acrylamide compounds followed by cyclization led to the formation of oxindoles, whereas the addition to cinnamic amides aroused a unique 1,4-aryl shift reaction. Furthermore, the difunctionalization of alkenes of prop-2-en-1-ols was also achieved through aroyl radical addition and a sequential 1,2-aryl shift cascade reaction.
作者:Chunhai Wang、Xiaoling Huang、Xueting Liu、Suqian Gao、Bin Zhao、Shangdong Yang
DOI:10.1016/j.cclet.2019.08.011
日期:2020.3
the unique biological activities, and they have some attractive prospects as clinical drug moleculars. Herein, a new approach for the synthesis of γ-oxo-phosphonates (the precursor of hydroxyphosphoric acid) has been established through the semipinacolrearrangement tactic involved the photo-induced phosphorus radical process. Most important, this transformation is avoid of the external oxidants, and
Visible light-mediated arylalkylation of allylic alcohols through concomitant 1,2-aryl migration
作者:Hong-Li Huang、Hang Yan、Chao Yang、Wujiong Xia
DOI:10.1039/c4cc10321a
日期:——
A photocatalytic process for selective arylalkylation of allylic alcoholsviaunique 1,2-aryl migration with α-bromo diethyl malonate has been developed.
Not only symmetrical, but also unsymmetrical α,α‐diaryl allylic alcohols are employed as substrates in the title reaction. A number of arenes and even heteroarenes underwent radical 1,2‐arylmigration (“neophyl rearrangement”) to produce α‐aryl β‐trifluoromethyl ketones. The preferential migration of electron‐deficient arylgroups over electron‐rich ones in unsymmetrical substrates supports the radical
Iron-catalyzedtrifluoromethylation with concomitant 1,2-migration of an aryl group starting from diaryl allyl alcohol was achieved under mild conditions. This reaction system affords alpha-substituted-beta-trifluoromethyl carbonyl compounds in high efficiency. In the case of substrates bearing different aryl groups, selective migration was observed.