Radical-Organometallic Hybrid Reaction System Enabling Couplings between Tertiary-Alkyl Groups and 1-Alkenyl Groups
摘要:
Suzuki-Miyaura couplings of tertiary-alkyl moieties are accomplished in the presence of a copper catalyst, in which quaternary carbons possessing various functional groups can be synthesized via a radical reaction. Mechanistic studies revealed that 1-alkenylcopper(I) plays an important role in this coupling reaction. We expect that the radical-organometallic combined process will become one of the best options for the synthesis of quaternary carbons.
Cu-Catalyzed Three-Component Carboamination of Alkenes
作者:Samuel N. Gockel、Travis L. Buchanan、Kami L. Hull
DOI:10.1021/jacs.7b10529
日期:2018.1.10
with 42 examples. Electron rich, electron poor, and internal styrenes, as well as α-olefins, are functionalized with α-halocarbonyls and aryl or aliphatic amines. Mechanistic investigations suggest the reaction is proceeding through addition of a carbon-centered radical across an olefin followed by oxidation to form a 5-membered oxocarbenium intermediate and subsequent nucleophilic ring opening to forge
The efficient Pd-catalyzed Heck reaction of diverse tertiary alkylhalides with alkenes has been developed. Unactivated tertiary alkylhalides efficiently react at room temperature under visible light irradiation with no exogenous photosensitizers required. For activated tertiary alkylhalides, the same catalytic system works well without light. These methods offer a general access to electronically
Tandem Reactions Enable Trans- and Cis-Hydro-Tertiary-Alkylations Catalyzed by a Copper Salt
作者:Kimiaki Nakamura、Takashi Nishikata
DOI:10.1021/acscatal.6b03343
日期:2017.2.3
synthesize trans- and cis-alkenes via well-controlled hydroalkylation of alkyl radicals to alkynes is reported. α-Bromocarbonyl compounds are useful alkyl radical precursors in the presence of Cu(I) catalysts. Under copper catalyst conditions and in the presence of silane or alcohol/B2pin2, trans- and cis-hydroalkylation occurred with excellent stereoselectivities. The judicious choice of additives allowed for
一种方法来合成反式-和顺式-烯烃通过良好控制的烷基基团,以炔烃的加氢烷基化报告。在Cu(I)催化剂存在下,α-溴羰基化合物是有用的烷基自由基前体。在铜催化剂条件下,在硅烷或醇/ B 2 pin 2的存在下,发生反式和顺式加氢烷基化反应,并具有出色的立体选择性。明智地选择添加剂可以实现这种立体发散,从而可以选择性地获得具有高收率的HSiTMS 3的反烷基化烯烃和t - BuOH / B 2 pin 2的顺式烷基化烯烃。