Palladium(II)-Catalyzed Annulation of Alkynes with <i>ortho</i>-Ester-Containing Phenylboronic Acids
作者:Hirokazu Tsukamoto、Yoshinori Kondo
DOI:10.1021/ol701776m
日期:2007.10.1
Palladium(II) catalyzes annulation of internal alkynes with methyl 2-boronobenzoate and (2-boronophenyl)acetate to provide 2,3-disubstituted indenones and 3,4-disubstituted 2-naphthols, respectively. The annulation reaction would proceed through transmetalation of Pd(II) with the boron reagents and insertion of the alkynes, followed by unprecedented 1,2-addition of the generated alkenylpalladium(II) species
钯(II)催化2-炔基苯甲酸甲酯和(2-炔基苯基)乙酸甲酯的内部炔烃环化反应,分别提供2,3-二取代的茚满和3,4-二取代的2-萘酚。通过用硼试剂对Pd(II)进行重金属化并插入炔烃,然后将生成的烯基钯(II)物种进行前所未有的1,2-加成到分子内酯基中,环化反应将继续进行。