benzhydrols 4a-f in good yields. From arylzinc compounds 1a,b, 3-aryl-1(3H)-isobenzofuranones 3a-f were given by the CrCl(3)-mediated reaction with arylaldehydes 2a-f. Diaryl ketones 5a-e were obtained in good yields by the addition of excess amount of benzaldehyde as an oxidant to the resulting solution after the CrCl(3)-mediated reaction between arylzinc compounds 1c-g and arylaldehydes 2b,g was completed
在
化学计量的CrCl(3)和三
甲基氯硅烷(TMSCl)的存在下,芳基
锌化合物1c-h向芳基醛2a,b,g的亲核加成反应在室温下平稳进行,以良好的收率得到相应的
苯甲醇4a-f。从芳基
锌化合物1a,b通过CrCl(3)介导的与芳基醛2a-f的反应得到3-芳基-1(3H)-
异苯并呋喃酮3a-f。在芳基
锌化合物1c-g与芳基醛2b,g之间完成CrCl(3)介导的反应后,通过向所得溶液中添加过量的
苯甲醛作为氧化剂,以高收率获得二芳基酮5a-e。在芳基
锌化合物1a,d,f与烷基6b-f的亲核加成中,在添加醛之前,需要用CrCl(3)处理芳基
锌化合物,以防止可烯化的醛对芳基
锌化合物的快速原型脱
锌。在这些CrCl(3)介导的芳基
锌化合物与醛的亲核加成反应中,芳基
铬(III)可能是反应性中间体。