Potassium Base‐Catalyzed Michael Additions of Allylic Alcohols to α,β‐Unsaturated Amides: Scope and Mechanistic Insights
作者:Masahiro Sai、Hiroaki Kurouchi
DOI:10.1002/adsc.202100272
日期:——
We report herein the first KHMDS-catalyzed Michaeladditions of allylic alcohols to α,β-unsaturated amides through allylic isomerization. The reaction proceeds smoothly in the presence of only 5 mol% of KHMDS to afford a variety of 1,5-ketoamides in high yields. Mechanistic investigations, including experimental and computational studies, reveal that the KHMDS-catalyzed in-situ generation of the enolate
A compound of formula I ##STR1## with R.sup.1 being an alkyl group substituted by one or more substituents and esters thereof at the 2-carboxy group or at the 8-hydroxy group or both; and salts thereof. Compounds I have antibacterial effect. Various intermediates are described. This compound of the formula I, or an ester at the 2-carboxy group or at the 8-hydroxy group or both or a salt thereof is produced by reacting a compound of formula II or of formula IX ##STR2## in which R represents a hydrogen atom or a carboxy protecting group, R.sup.3 represents an activated carboxylic acid group, R.sup.4 represents an alkyl group having 1 to 4 carbon atoms, or a phenyl group which may be unsubstituted or substituted, R.sup.15 represents a phenyl group or an alkyl group having from 1 to 4 carbon atoms, and X represents an oxygen or sulphur with an amine of the formula III R.sup.1 NH.sub.2 (III) to give a compound of formula I, or an ester thereof of formula Ia ##STR3##
[EN] MOLECULAR PRECURSORS FOR OPTOELECTRONICS<br/>[FR] PRÉCURSEURS MOLÉCULAIRES POUR L'OPTOÉLECTRONIQUE
申请人:PRECURSOR ENERGETICS INC
公开号:WO2011084171A1
公开(公告)日:2011-07-14
This invention relates to compounds and compositions used to prepare semiconductor and optoelectronic materials and devices. This invention provides a range of compounds, compositions, materials and methods directed ultimately toward photovoltaic applications, as well as devices and systems for energy conversion, including solar cells. In particular, this invention relates to molecular precursor compounds and precursor materials for preparing photovoltaic layers.