Directed Ortho Metalation Methodology. The <i>N</i>,<i>N</i>-Dialkyl Aryl <i>O</i>-Sulfamate as a New Directed Metalation Group and Cross-Coupling Partner for Grignard Reagents
作者:Todd K. Macklin、Victor Snieckus
DOI:10.1021/ol050393c
日期:2005.6.1
with a variety of electrophiles constitutes a new general route to substituted aryl O-sulfamates 4a-k. The Kumada-Corriu cross-coupling of O-sulfamates 4e, 4n-s, and 6a with Grignard reagents gives biaryls 9a-m, and the use of 2-halo and boron derivatives 4h, 4i, and 4k for Suzuki-Miyaura cross-coupling and generation of benzynes leads to naphthols 7a and 7b. A relative metalation ranking of the OSONEt(2)
[反应:参见文本] 3的邻位金属化(RLi / THF / -93摄氏度),然后用各种亲电试剂淬火,构成了取代O-氨基磺酸芳基酯4a-k的新通用路线。O-氨基磺酸盐4e,4n-s和6a与Grignard试剂的Kumada-Corriu交叉偶联可得到联芳基9a-m,而Suzuki-Miyaura交叉使用2-halo和硼衍生物4h,4i和4k。苯并炔的偶合和生成导致萘酚7a和7b。报告了OSONEt(2)的相对金属化等级。