A Novel Synthesis of Esters via Substitution of the Benzotriazolyl Group in 1-(Benzotriazol-1-yl)alkyl Esters with Organozinc Reagents
作者:Alan R. Katritzky、Stanislaw Rachwal、Bogumila Rachwal
DOI:10.1055/s-1991-26382
日期:——
Aldehydes are converted by thionyl chloride and benzotriazole into 1-(1-chloroalkyl)benzotriazoles which react with sodium carboxylates to give 1-(benzotriazol-1-yl)alkyl esters 3. In an alternative route, 3 are prepared by substitution of one of the acetoxy groups in acylals with benzotriazole. The benzotriazolyl moiety in 3 is substituted by an alkyl, an aryl or an alkynyl group upon treatment with an organozinc reagent in a new versatile synthesis of esters 4.
An efficient general synthesis of 1-(benzotriazol-1-yl)alkyl esters
作者:Alan R. Katritzky、Alfredo Pastor、Michael V. Voronkov
DOI:10.1002/jhet.5570360333
日期:1999.5
1-(Benzotriazol-1-yl)alkyl esters 2a-u were obtained in yields averaging 86% by the direct reaction of various aldehydes with the corresponding N-acylbenzotriazoles in the presence of a catalytic amount of potassium carbonate (10–25 mole %). The procedure was optimized by evaluating the effects of solvent, catalyst, temperature and other parameters.