Formal hydrochromation of an alkyne leading to a 1-substituted ethenylchromium reagent is accomplished by addition of the alkyne and water to a mixture of low-valent chromium(II), a catalytic amount of nickel(II), and triphenylphosphine in DMF.
Regioselective Reductive Coupling of Alkynes and Aldehydes Leading to Allylic Alcohols
作者:Kazuhiko Takai、Shuji Sakamoto、Takahiko Isshiki
DOI:10.1021/ol0272996
日期:2003.3.1
Treatment of a mixture of a terminal alkyne and an aldehyde with CrCl(2) and a catalytic amount of NiCl(2) and triphenylphosphine in the presence of water in DMF at 25 degrees C gives a 1,2-disubstituted allylicalcohol regioselectively.
Highly Regio- and Stereoselective Hydrostannylation of Propargyl Alcohols and Ethers Using Dibutylchlorostannane and Lithium Chloride
作者:Katsukiyo Miura、Akira Hosomi、Di Wang
DOI:10.1055/s-2004-837219
日期:——
In the presence of LiCI, dibutylchlorostannane (Bu 2 SnClH) reacted with γ-unsubstituted propargyl alcohols and ethers to give γ-stannylated allyl alcohols and ethers, respectively, with high regio- and stereoselectivity. These vinylstannane products could be successfully utilized for the Pd-catalyzed cross-coupling reaction.