Continuous multistep synthesis of 2-(azidomethyl)oxazoles
作者:Thaís A Rossa、Nícolas S Suveges、Marcus M Sá、David Cantillo、C Oliver Kappe
DOI:10.3762/bjoc.14.36
日期:——
An efficient three-step protocol was developed to produce 2-(azidomethyl)oxazoles from vinyl azides in a continuous-flow process. The general synthetic strategy involves a thermolysis of vinyl azides to generate azirines, which react with bromoacetyl bromide to provide 2-(bromomethyl)oxazoles. The latter compounds are versatile building blocks for nucleophilic displacement reactions as demonstrated
One-Pot Synthesis of Multifunctionalized 1-Pyrrolines from 2-Alkyl-2<i>H</i>-azirines and Diazocarbonyl Compounds
作者:Ilya P. Filippov、Mikhail S. Novikov、Alexander F. Khlebnikov、Nikolai V. Rostovskii
DOI:10.1021/acs.joc.2c00977
日期:2022.7.1
the synthesis of 1-pyrrolines based on formal [4 + 1] annulation of 2-alkyl-2H-azirines with diazocarbonyl compounds has been developed. This one-pot approach includes the Rh(II)-catalyzed formation of 4-alkyl-2-azabuta-1,3-dienes, followed by the DBU-promoted cyclization, and features a good substrate tolerance. The 1-pyrrolines containing an ester group at the C3 were prepared in a three-step one-pot
Multicomponent Synthesis of Structurally Diverse Imidazoles Featuring Azirines, Amines and Aldehydes
作者:Thaís A. Rossa、Mariane Fantinel、Adailton J. Bortoluzzi、Marcus M. Sá
DOI:10.1002/ejoc.201800687
日期:2018.8.15
A straightforward method for the synthesis of tetrasubstituted imidazoles was developed, employing readily available starting materials and environmentally benign conditions.
开发了一种简单易用的合成四取代咪唑的方法,采用了容易获得的起始原料和环境友好的条件。
Electronically Mediated Selectivity in Ring Opening of 1-Azirines. The 3-X Mode: Convenient Route to 3-Oxazolines
作者:Marcus C. M. Sá、Albert Kascheres
DOI:10.1021/jo9518866
日期:1996.1.1
base-promoted reaction of methyl 2-phenyl-1-azirine-3-acetate (1) with aldehydes and acetone provides a new and simple route to the 3-oxazolines 5, which are formed in good yields by the electrophilic trapping of an imino anion produced by C-N bond cleavage in the 1-azirine enolate intermediate 6. Chloranil oxidation of 5 containing an aromatic substituent at C-2 affords oxazoles 7, while reaction of 5 containing