alpha -Keto-2-oxazolines 5a-j have been efficiently prepared by lithiation [sec-(or n-)BuLi/TMEDA, Et2O, -100 degreesC] and rearrangement of oxiranyl oxazolines 2a-j. (C) 2000 Published by Elsevier Science Ltd.
An oxazoline-mediated synthesis of formyl epoxides
作者:Saverio Florio、Vito Capriati、Renzo Luisi
DOI:10.1016/0040-4039(96)00934-3
日期:1996.7
α,β-epoxy aldehydes have been prepared by deblocking of oxazolinyl oxiranes, which in turn have been synthesized on treatment of 4,4-dimethyloxazolinylchloromethyllithium with aldehydes.
[reaction: see text] The stereoselective synthesis of novel alpha-epoxy-beta-amino acids is described by a route that combines the chemistry of oxazolinyloxiranyllithiums with that of nitrones. The intermediate trioxadiazadispiro[2.0.4.3]undecanes 4 have been isolated and converted by hydrolysis into epoxy-5-isoxazolidinones 5 which can be transformed into the alpha-epoxy-beta-amino acids 8 by N-O