Base-induced rearrangement of 1-(trimethylsilyl)allylic alcohols. Stereo- and regioselective synthesis of silyl enol ethers through lithium homoenolates
Methylenations of heteroatom-substituted carbonyls with dimethyl titanocene
作者:Nicos A. Petasis、Shao-Po Lu
DOI:10.1016/0040-4039(95)00320-c
日期:1995.4
Reaction of dimethyl titanocene with a variety of heteroatom-substituted carbonylcompounds, including: silylesters, anhydrides, carbonates, amides, imides, thioesters, selenoesters and acyl silanes gives the corresponding heteroatom-substituted alkenes.
Synthesis of optically active 4-hydroxyalk-2-enenitriles; Reaction of optically active 2-(p-chlorophenylsulfinyl)acetonitrile with aldehydes in the presence of piperidine in acetonitrile
Reaction of opticallyactive 2-(p-chlorophenylsulfinyl)acetonitrile ((R)-) with aldehydes, in the presence of piperidine in acetonitrile at r.t., gave opticallyactive 4-hydroxyalk-2-enenitriles in good optical and chemical yields. The absolute configuration of (−)-4-hydroxypent-2-enenitrile, predominantly obtained by the reaction of (R)- with propanal, was determined to be R.
Carbeneinsertionreactions with B-H bonds are a challenging but promising method for synthesis of organoboranes. Herein, we report visible-light-induced B-H insertions of HBpin with acylsilane. This metal-free and operationally simple reaction pro-ceeds in an atom-economical way with broad substrate scope under mild reaction conditions, affording a variety of important α-alkoxyorganoboronate esters
Acylsilanes can easily be prepared by the anodic oxidation of 2-alkyl-2-trialkylsilyl-1, 3-dithianes with a platinum anode in wet acetonitrile. This electrochemical reaction provides a general and convenient access to aroyl, saturated and α, β-unsaturated acylsilanes.