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.
醛类在亚硫酰氯和苯并三唑的作用下,转化为1-(1-氯烷基)苯并三唑,后者与钠羧酸盐反应生成1-(苯并三唑-1-基)烷基酯3。另一种途径是通过苯并三唑替代酰基中的一个乙酸酯基来制备3。在3中,苯并三唑基团通过与有机锌试剂反应,被烷基、芳基或炔基团取代,从而在一种新的多功能酯4合成中实现取代。