A Simple and Modular Strategy for Small Molecule Synthesis: Iterative Suzuki−Miyaura Coupling of B-Protected Haloboronic Acid Building Blocks
作者:Eric P. Gillis、Martin D. Burke
DOI:10.1021/ja0716204
日期:2007.5.1
We herein describe a simple and highly modular strategy for small molecule synthesis involving the iterative cross-coupling of B-protected bifunctional haloboronic acids. Enabling this approach, we have newly discovered that the pyramidalization of boronic acids via complexation with the trivalent ligand N-methyliminodiacetic acid inhibits their reactivity towards cross-coupling. This ligand is remarkably
我们在此描述了一种简单且高度模块化的小分子合成策略,涉及 B 保护的双功能卤代硼酸的迭代交叉偶联。启用这种方法,我们新发现硼酸通过与三价配体 N-甲基亚氨基二乙酸络合的锥体化抑制了它们对交叉偶联的反应性。该配体对无水 Suzuki-Miyaura 条件非常稳定,但使用温和的碱水溶液(1 M NaOH/THF 水溶液,10 分钟,23°C 或饱和 NaHCO3/MeOH 水溶液,23°C,6 小时)易于裂解。尽管芳基、杂芳基、烯基和烷基硼酸的反应性可能会有很大差异,但该方法可有效保护和去保护所有四类亲核试剂。利用这种潜力,