Nucleophilic Additions of Arylzinc Compounds to Aldehydes Mediated by CrCl<sub>3</sub>: Efficient and Facile Synthesis of Functionalized Benzhydrols, 1(3<i>H</i>)-Isobenzofuranones, Benzyl Alcohols, or Diaryl Ketones
作者:Yoshihiro Ogawa、Akihiro Saiga、Mitsuo Mori、Takanori Shibata、Kentaro Takagi
DOI:10.1021/jo991444k
日期:2000.2.1
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。