A New Catalytic Cross-Coupling Approach for the Synthesis of Protected Aryl and Heteroaryl Amidines
作者:Carrie L. Kusturin、Lanny S. Liebeskind、William L. Neumann
DOI:10.1021/ol025547s
日期:2002.3.1
new method for the synthesis of protected benzamidines is described. The commercially available 1,3-bis(tert-butoxycarbonyl)-2-methyl-2-thiopseudourea guanidylation reagent, after SEM-protection, functions as an amidine-forming cross-coupling partner under Liebeskind-Srogl conditions. In the presence of copper(I) thiophenecarboxylate (CuTC), the palladium-catalyzed cross-coupling of the SEM-protected
[反应:见正文]描述了一种合成被保护的苄am的新方法。在SEM保护之后,市售的1,3-双(叔丁氧基羰基)-2-甲基-2-硫代伪脲胍基化试剂在Liebeskind-Srogl条件下充当形成am的交叉偶联伴侣。在噻吩甲酸铜(I)(CuTC)的存在下,由SEM保护的硫代伪脲试剂与硼酸的钯催化交叉偶联可提供完全保护的苯甲am,收率好至极佳(40-91%)。