Directed <i>ortho</i> Metalation-Based Methodology. Halo-, Nitroso-, and Boro-Induced <i>ipso-</i>Desilylation. Link to an <i>in situ</i> Suzuki Reaction
作者:Zhongdong Zhao、Victor Snieckus
DOI:10.1021/ol0506563
日期:2005.6.1
[reaction: see text] Treatment of DoM-derived silylated aromatics 2-4 under standard electrophilic halogenation conditions cleanly affords ipso-desilyation products 5-7, while nitration of methoxy-substituted analogues 8, 9 leads to non-ipso isomers 10, 12 and 11, 13, controlled by a silicon steric effect. Sequential ipso-borodesilylation of 2a, 3a, and 20 followed by treatment with aryl halides under
[反应:请参见文本]在标准的亲电子卤化条件下处理DoM衍生的甲硅烷基化芳族化合物2-4,可干净地获得ipso脱水产物5-7,而将甲氧基取代的类似物8、9硝化可生成非ipso异构体10、12和11、13受硅空间效应控制。2a,3a和20的顺序ipso-borodesilylation,然后在Pd催化条件下用芳基卤化物处理,构成了原位Suzuki-Miyaura交叉偶联方案,实现了联芳基和杂联芳基23。