摘要 通过五个步骤从市售水杨醛合成了一系列在支架的 7、8 或 9 位具有不同取代模式的3 H -1,2-苯并氧杂膦 2-氧化物芳基衍生物。研究了所有新获得的化合物对碳酸酐酶 (CA) 亚型 I、II、IX 和 XII 的抑制效力。令人高兴的是,这些化合物对癌症相关的 CA IX 和 XII 表现出对细胞质 CA I 和 II 的惊人选择性,而细胞质 CA I 和 II 的抑制可能会导致副作用。总体而言,构效关系 (SAR) 显示 7- 和 8- 取代的芳基衍生物比 9- 取代的衍生物是更有效的 CA IX 和 XII 抑制剂。此外,含氟类似物成为该系列中最有效的 CA IX/XII 抑制剂。
Electrooxidative Rhodium‐Catalyzed [5+2] Annulations via C−H/O−H Activations
作者:Yulei Wang、João C. A. Oliveira、Zhipeng Lin、Lutz Ackermann
DOI:10.1002/anie.202016895
日期:2021.3.15
five‐ and six‐membered heterocycles. In contrast, we herein describe the first electrochemical metal‐catalyzed [5+2] cycloadditions to assemble valuable seven‐membered benzoxepine skeletons by C−H/O−H activation. The efficient alkyne annulation featured ample substrate scope, using electricity as the only oxidant. Mechanistic studies provided strong support for a rhodium(III/I) regime, involving a
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,
SYSTEM FOR CONTROLLING THE REACTIVITY OF BORONIC ACIDS
申请人:Burke Martin D.
公开号:US20090030238A1
公开(公告)日:2009-01-29
A protected organoboronic acid includes a boron having an sp
3
hybridization, a conformationally rigid protecting group bonded to the boron, and an organic group bonded to the boron through a boron-carbon bond. A method of performing a chemical reaction includes contacting a protected organoboronic acid with a reagent, the protected organoboronic acid including a boron having an sp
3
hybridization, a conformationally rigid protecting group bonded to the boron, and an organic group bonded to the boron through a boron-carbon bond. The organic group is chemically transformed, and the boron is not chemically transformed.
of the C-10 stereogenic center was elucidated. The key feature of the synthesis involves the efficient Cu(II)-mediated coupling of two aromatic moieties for the diaryl ether intermediate and the enantioselective construction of the hydroxypropyl substituent by a regio- and stereoselective methyl addition to the chiral aryloxiranes in an inversion manner.
Full details of studies directedtoward the totalsynthesis of both enantiomers of rodgersinol are described. The key parts of our synthetic route to rodgersinol included the Cu(II)-mediated coupling of an arylboronic acid with an ortho-alkyl substituted phenol and regio- and stereoselective construction of the hydroxypropyl substituent, which avoided tedious protection/deprotection sequence.