Various N,N-disubstituted carbamoyltrimethylsilanes can be prepared by the addition of LDA to a mixture of TMSCl and the appropriate formamide in THF at -78degreesC. Slow (syringe pump) addition of LDA is crucial to obtaining good yields.
Alkenyl chlorides and bromides are converted into tertiary enamides by treatment with a carbamoylsilane in toluene at 110 degrees C in the presence of phosphine-palladium(0) catalysts. [reaction: see text]
Organocatalytic aminocarbonylation of α,β-unsaturated ketones with <i>N</i>,<i>N</i>-dimethyl carbamoylsilane
作者:Shou-Shan Yang、Ying-Zheng Ren、Yu-Yu Guo、Guang-Fen Du、Zhi-Hua Cai、Lin He
DOI:10.1039/d1nj00782c
日期:——
An organic superbase-catalyzed aminocarbonylation reaction of α,β-unsaturatedketones was reported. Under the catalysis of 10 mol% Schwesinger's superbase t-Bu-P4, a variety of enones and ynones reacted with N,N-dimethyl carbamoylsilane to afford α-siloxyamides or α-hydroxyamides in 56–82% yields.
ethers and the [4+2] cycloadducts between the silene and diene, which confirms the presence of 2 and that it is unreactive towards alcohols. The observed silylethers are substitution adducts where the amide group of the silylamide is replaced by an alkoxy group, and the reaction time is reflected in the steric bulk of the alcohol. Indeed, the formation of silylethers from the reaction of alcohols with
Selective Addition of Carbamoylsilane to Vicinal Diketones: Highly Efficient Synthesis of β-Keto-α-hydroxyamides
作者:Jianxin Chen、Pei Cao、Xueping Wen
DOI:10.1055/s-0036-1588346
日期:——
The selective addition of carbamoylsilane to vicinal diketones in toluene solvent at 110 °C affords β-keto-α-siloxyamide derivatives in good yields (54–99%). The sterichindrance is an important factor in the addition reaction.
在 110 °C 的甲苯溶剂中,将氨基甲酰基硅烷选择性加成到邻位二酮中,以良好的产率 (54-99%) 得到 β-酮-α-甲硅烷氧基酰胺衍生物。位阻是加成反应中的一个重要因素。
Selective C H functionalization of electron-deficient aromatics by carbamoylsilanes: synthesis of aromatic carbinolamines or amides
作者:Yanhong Liu、Pei Cao、Jianxin Chen
DOI:10.1016/j.tetlet.2016.01.058
日期:2016.2
Selective CH functionalization of electron-deficient aromatics with various carbamoylsilanes is developed under catalysts-free conditions. These transformations provide a facile and efficient method for synthesizing some tertiary or secondary aromatic carbinolamines and amides in good yields.