Nickel-Catalyzed Allylic Substitution of Simple Alkenes
作者:Ryosuke Matsubara、Timothy F. Jamison
DOI:10.1002/asia.201000875
日期:2011.7.4
This report describes a nickel‐catalyzed allylic substitution process of simplealkenes whereby an important structural motif, a 1,4‐diene, was prepared. The key to success is the use of an appropriate nickel–phosphine complex and a stoichiometric amount of silyl triflate. Reactions of 1‐alkyl‐substituted alkenes consistently provided 1,1‐disubstituted alkenes with high selectivity. Insight into the
B(C<sub>6</sub>
F<sub>5</sub>
)<sub>3</sub>
-Catalyzed Ring Opening and Isomerization of Unactivated Cyclopropanes
作者:Zi-Yu Zhang、Zhi-Yun Liu、Rui-Ting Guo、Yu-Quan Zhao、Xiang Li、Xiao-Chen Wang
DOI:10.1002/anie.201700864
日期:2017.3.27
Catalytic amounts of B(C6F5)3 promote the ring opening and subsequent isomerization of a series of unactivated cyclopropanes to afford terminal olefins in good yields when a hydrosilane and 2,6‐dibromopyridine are employed as additives.
催化量的B(C 6 F 5)3促进开环和随后一系列未活化环丙烷的异构化,从而在使用氢化硅烷和2,6-二溴代吡啶作为添加剂时以高收率提供末端烯烃。
Palladium-Catalyzed Hydrocarbonylative Cyclization of 1,5-Dienes
novel and atom-economic palladium-catalyzed isomerization-hydrocarbonylative cyclization reaction of 1,5-dienes to 2-alkylidenecyclopentanones has been developed, which provides a rapid and straightforward approach to 2-alkylidenecyclopentanones with high stereoselectivity. The reaction was found to proceed via alkene isomerization and selective hydrocarbonylative cyclization to generate 2-alkylidenecyclopentanones
Rhodium-catalyzed allylation of styrenes with allyl tosylate
作者:Naofumi Tsukada、Tetsuo Sato、Yoshio Inoue
DOI:10.1039/b007880h
日期:——
Rhodium-catalyzed allylation of styrene with allyl tosylate
gave 1-phenylpenta-1,4-diene, and various styrene derivatives were also
allylated yielding 1,4-dienes or 1,5-dienes.
Radical Isomerization and Cycloisomerization Initiated by H• Transfer
作者:Gang Li、Jonathan L. Kuo、Arthur Han、Janine M. Abuyuan、Lily C. Young、Jack R. Norton、Joshua H. Palmer
DOI:10.1021/jacs.6b03509
日期:2016.6.22
concentration of an H• donor. Transfer of the H• onto an olefin gives a radical that can either (1) transfer an H• back to the metal, generating an isomerized olefin, or (2) add intramolecularly to a double bond, generating a cyclized radical. Transfer of an H• back to the metal from the cyclized radical results in a cycloisomerization. Both outcomes are favored by the low concentration of the cobalt H• donor,