Metal-free borylative ring-opening of vinyl epoxides and aziridines
作者:Xavier Sanz、Graham M. Lee、Cristina Pubill-Ulldemolins、Amadeu Bonet、Henrik Gulyás、Stephen A. Westcott、Carles Bo、Elena Fernández
DOI:10.1039/c3ob41328d
日期:——
vinylaziridines, by the in situ formed MeO−→bis(pinacolato)diboron adduct, has been developed. The enhanced nucleophilic character of the Bpin (sp2) moiety from the reagent favours the SN2′ conjugated B addition with the concomitant opening of the epoxide and aziridine rings. The reaction proceeds with total chemoselectivity towards the polyfunctionalised (–OH or –NHTs) allyl boronate. Theoretical calculations
朝vinylepoxides和vinylaziridines的borylative开环,由A合理的方法在原位形成的MeO - →双(频哪醇合)二硼加合物,已经研制成功。试剂中Bpin(sp 2)部分增强的亲核特性有助于S N 2'共轭B的加成,同时伴随着环氧化物和氮丙啶环的开放。反应以对多官能化(-OH或-NHTs)烯丙基硼酸酯的总化学选择性进行。理论计算已经确定来自与被激活的MeO乙烯基类基底的反应的过渡态-→双(频哪醇)二硼加合物,并提出了有机催化的硼基开环反应的合理机理。