2-Propynylamines from 1,1-Dibromo-1-alkenes Easily accessible 1,1-dibromo-1-alkenes 1 react with primary or secondary amines in a complex series of reactions to give directly N-substituted or N,N-disubstituted (1-Alkyl-1-aryl-2-propynyl)- amines 5 in useful yields. This simple method avoids the isolation of the intermediates (bromoacetylenes or bromoallenes) and makes a series of 2-propynylamines with an acetylenic hydrogen available.
FREY, HERBERT;KAUPP, GERD, SYNTHESIS,(1990) N0, C. 931-934
作者:FREY, HERBERT、KAUPP, GERD
DOI:——
日期:——
Direct Synthesis of α‐Allenols from TMS‐Protected Alkynes and Aldehydes Mediated by Tetrabutylammonium Fluoride
作者:Xiaojun Huang、Alejandro Bugarin
DOI:10.1002/chem.201603250
日期:2016.8.26
chemoselective synthesis of α‐allenic alcohols is presented. Tetrabutylammoniumfluoride (TBAF) mediated this transformation under mild reaction conditions. A range of functional groups is well‐tolerated in this reaction, while affording adducts in moderate to excellent yields (48–96 %, average 76 %). Mechanistic studies, including the use of tetrabutylammonium hydroxide (TBAH), revealed that the hydroxide ion