A highly efficient Cu catalyst system for the radical reactions of α-bromocarbonyls
作者:Yushi Noda、Takashi Nishikata
DOI:10.1039/c7cc01790a
日期:——
A Cu/TPMA and diisopropylamine system realized highly efficient atom-transfer radical reactions (substitution and cyclization). A maximum TON of up to 25 000 was achieved.
Organo-photoredox-Catalyzed Atom-Transfer Radical Substitution of Alkenes with α-Carbonyl Alkyl Halides
作者:Goki Hirata、Taisei Shimada、Takashi Nishikata
DOI:10.1021/acs.orglett.0c03359
日期:2020.11.20
(ATRS) and carboesterification reaction of alkenes with alkyl halides has been developed using PTH as the organo-photoredox catalyst. Two types of products were obtained, depending on the additive and solvent used during the reaction. Primary, secondary, and tertiary alkyl halides reacted to give the ATRS products. This protocol has several advantages: it requires mild reaction conditions and a low catalyst
Nickel-Catalyzed Heck-Type Alkenylation of Secondary and Tertiary α-Carbonyl Alkyl Bromides
作者:Chao Liu、Shan Tang、Dong Liu、Jiwen Yuan、Liwei Zheng、Lingkui Meng、Aiwen Lei
DOI:10.1002/anie.201108350
日期:2012.4.10
Ni made it! A novel Heck‐type reaction of secondary and tertiary α‐carbonyl alkyl bromides, most likely involving a radical process, was achieved through the use of a nickel catalyst. Various substituted styrenes and 1,1‐diaryl alkenes were utilized as substrates to easily construct α‐alkenyl carbonyl compounds with tertiary or quaternary carbon centers. A catalytic cycle involving NiI/NiII is proposed
倪做到了!通过使用镍催化剂,实现了仲和叔α-羰基烷基溴化物的新型Heck型反应,最有可能涉及自由基过程。各种取代的苯乙烯和1,1-二芳基烯烃被用作底物,以轻松构建具有叔碳或季碳中心的α-烯基羰基化合物。基于我们的实验结果,提出了涉及Ni I / Ni II的催化循环。EWG =吸电子基团。
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。