Catalytic carbonyl hydrosilylations via a titanocene borohydride–PMHS reagent system
作者:Godfred D. Fianu、Kyle C. Schipper、Robert A. Flowers II
DOI:10.1039/c7cy01088e
日期:——
Reduction of a wide range of aldehydes and ketones with catalytic amounts of titanocene borohydride in concert with a stoichiometric poly(methylhydrosiloxane) (PMHS) reductant is reported. Preliminary mechanistic studies demonstrate that the reaction is mediated by a reactive titanocene(III) complex, whose oxidation state remains constant throughout the reaction.
Highly Chemoselective Catalytic Hydrogenation of Unsaturated Ketones and Aldehydes to Unsaturated Alcohols Using Phosphine-Stabilized Copper(I) Hydride Complexes
作者:Jian-Xin Chen、John F. Daeuble、Donna M. Brestensky、Jeffrey M. Stryker
DOI:10.1016/s0040-4020(99)01098-4
日期:2000.4
phenyldimethylphosphine-stabilized copper(I) hydride complex provides for the highly chemoselective hydrogenation of unsaturated ketones and aldehydes to unsaturated alcohols, including the regioselective 1,2-reduction of α,β-unsaturated ketones and aldehydes to allylic alcohols. The active catalyst can be derived in situ by phosphine exchange using commercial [(Ph3P)CuH]6 or from the reaction of copper(I) chloride
Cerium-free Luche reduction directed by rehydrated alumina
作者:Ebenezer Jones-Mensah、Leslie A. Nickerson、Jackson L. Deobald、Hailey J. Knox、Alyssa B. Ertel、Jakob Magolan
DOI:10.1016/j.tet.2016.03.017
日期:2016.6
A 1,2-regioselective reduction of α,β-unsaturatedketones to their corresponding allylicalcohols is accomplished with NaBH4 in the presence of acidic activated alumina rehydrated to the Brockmann II grade by adding 3 % w/w water. The substrate scope includes eight ketones reduced in high regio- and diastereoselectivity to their corresponding allylicalcohols. This is the first example of the strategy
alpha,beta-Unsaturated ketones were reduced to allylic alcohols with high chemo- and diastereoselectivity, using Zr and Hf compounds heterogenised on mesoporous molecular sieves.
Reactions of (organostannyl)- and (organogermyl)lithium reagents with some (allylic) cyclohex-2-enyl chlorides