Organometallic reaction in aqueous media. A samarium induced, efficient, synthesis of homoallyl hydroxylamines and hydrazides
摘要:
Samarium can be used directly for the allylation of aldonitrones and hydrazones in aqueous media in the presence of Bu4NBr. (C) 2001 Elsevier Science Ltd. All rights reserved.
1,3-Dipolar cycloadditions to 5-methoxy-2(5H)-furanone
作者:Erik Keller、Ben de Lange、Minze T. Rispens、Ben L. Feringa
DOI:10.1016/s0040-4020(01)81909-8
日期:1993.1
Various nitrile oxides and nitrones, ethyl diazoacetate and an azomethine ylide were examined in 1,3-dipolarcycloadditions to 5-methoxy-2[5H]-furanone, in particular with respect to regio- and diastereoselectivities. Isoxazoles 13–17 and isoxazolidines 21, 22 and 24 were obtained in high yields with anti-facial selectivities and regioselectivities exceeding 95%. In the case of pyrazoline 26 minor
Indium-mediated propargylation of imines and imine oxides in aqueous media: propargylation of CN- centres
作者:Dipak Prajapati、Dhrubojyoti D. Laskar、Baikuntha J. Gogoi、Gitali Devi
DOI:10.1016/s0040-4039(03)01640-x
日期:2003.8
The indium-catalysed coupling of propargyl bromide with a variety of imines and imine oxides afforded the corresponding propargylated products in high yields under mild conditions. (C) 2003 Elsevier Ltd. All rights reserved.