The solvent-free and catalyst-free conversion of an aziridine to an oxazolidinone using only carbon dioxide
作者:Chau Phung、Rani M. Ulrich、Mostafa Ibrahim、Nathaniel T. G. Tighe、Deborah L. Lieberman、Allan R. Pinhas
DOI:10.1039/c1gc15850c
日期:——
It has been found for the first time at room temperature that the reaction of an unactivated 2-alkyl or 2-aryl aziridine with carbon dioxide to generate the corresponding oxazolidinone does not need any form of catalysis or solvent to proceed in high yield, especially when using high speed ball milling.
Process for preparing hydroxyalkylbenzocyclobutenes
申请人:The Dow Chemical Company
公开号:US05349095A1
公开(公告)日:1994-09-20
A process for preparing a substituted or unsubstituted 3- or 4-hydroxyalkylbenzocyclobutene compound comprises reducing a corresponding 3- or 4-formyl or ketobenzocyclobutene compound with a hydride at a temperature below that at which dimerization or oligomerization of the formyl- or ketobenzocycloutene compound or the thus-produced hydroxyalkylbenzocyclobutene compound is a significant side reaction, for a time sufficient to convert the formyl- or ketobenzocyclobutene compound to the hydroxyalkylbenzocyclobutene compound. In a two-step process, formylbenzocyclobutenes are prepared from bromobenzocyclobutenes in 90% yield or from benzocyclobutenes in a 70% yield, and then converted to hydroxymethylbenzocyclobutenes for an overall yield of about 85% from a bromobenzocyclobutene or of about 65% from a benzocyclobutene. In a two-step process, ketobenzocyclobutenes from bromobenzocyclobutene Grignard reagents and an N-alkanoyl- or N-aroyl-2-methylaziridine are converted to hydroxyalkylbenzocyclobutenes in high yields.