Synthesis of Allylic Alcohols via Cu-Catalyzed Hydrocarbonylative Coupling of Alkynes with Alkyl Halides
作者:Li-Jie Cheng、Shahidul M. Islam、Neal P. Mankad
DOI:10.1021/jacs.7b12582
日期:2018.1.24
suggested a different pathway was operative with tertiary alkyl halides compared with primary and secondary alkyl halides for generating the key copper(III) oxidative adduct. For tertiary electrophiles, an acyl halide likely forms via radical atom transfer carbonylation. The preference for 1,2-reduction over 1,4-reduction of α,β-unsaturated ketonesbearing tertiary substituents was rationalized using density
Heterobimetallic Control of Regioselectivity in Alkyne Hydrostannylation: Divergent Syntheses of α- and (<i>E</i>)<i>-</i>β<i>-</i>Vinylstannanes via Cooperative Sn–H Bond Activation
作者:Li-Jie Cheng、Neal P. Mankad
DOI:10.1021/jacs.9b00068
日期:2019.2.27
terminal alkynesunder mild conditions, with Markovnikov/anti-Markovnikov selectivity controlled by the Cu/M pairing. By using the MeIMesCu-FeCp(CO)2 catalyst, a variety of α-vinylstannanes were produced from simple alkyl-substituted alkynes and Bu3SnH in high yield and good regioselectivity; these products are challenging to access under mononuclear metal-catalyzed hydrostannylation conditions. In addition
Catalytic Enantioselective Synthesis of α-Substituted Secondary Allylic Alcohols from Terminal Alkynes and Aldehydes via Vinylaluminum Reagents
作者:Ravindra Kumar、Hiroki Kawasaki、Toshiro Harada
DOI:10.1002/chem.201303619
日期:2013.12.23
highly enantioselective synthesis of α‐substituted allylicalcohols has been developed starting from readily available terminal alkynes and aldehydes and proceeding via vinylaluminum reagents (see scheme, dppp=1,3‐bis(diphenylphosphino)propane). The use of Me2AlH is essential in the Ni‐catalyzed hydroalumination step to generate vinylaluminum reagents that cannot reduce the aldehyde.
Efficient Pd(0)-Catalyzed Hydrosilylation of Alkynes with Triorganosilanes
作者:Koichiro Oshima、Dai Motoda、Hiroshi Shinokubo
DOI:10.1055/s-2002-33535
日期:——
An electron-rich Pd(0) complex, a Pd 2 (dba) 3 .CHCl 3 -tri-cyclohexylphosphine combination catalyzes highly efficient hydrosilylation of alkynes at room temperature with Ph 3 SiH or Ph 2 MeSiH without solvents. The regioselectivity of this process is higher than that with the conventional Pt(0)-catalyzed hydrosilylation.