Synthesis of Ortho Substituted Arylboronic Esters by in Situ Trapping of Unstable Lithio Intermediates
作者:Jesper Kristensen、Morten Lysén、Per Vedsø、Mikael Begtrup
DOI:10.1021/ol015598+
日期:2001.5.1
using lithium 2,2,6,6-tetramethylpiperidide (LTMP) in combination with triisopropylborate (B(OiPr)(3)) is a highly efficient and experimentally straightforward process for the preparation of ortho substituted arylboronic esters. The mild reaction conditions allow the presence of functionalities such as ester or cyano groups or halogen substituents that are usually not compatible with the conditions used
[反应:参见正文]使用2,2,6,6-四甲基哌啶锂(LTMP)与三异丙基硼酸酯(B(OiPr)(3))结合进行原位锂化是一种高效且实验简单的制备方法取代的芳基硼酸酯的制备。温和的反应条件允许存在官能团,例如酯或氰基或卤素取代基,这些官能团通常与在芳烃的定向邻位金属化中使用的条件不兼容。芳基硼酸酯与多种芳基卤化物进行了铃木型交叉偶联,以53-94%的收率提供了联芳基。