Simple and Versatile Catalytic System for N-Alkylation of Sulfonamides with Various Alcohols
摘要:
A simple and versatile catalytic system for N-alkylation of sulfonamides with various alcohols based on a catalytic hydrogen transfer reaction has been developed under a low catalyst loading of [Cp*IrCl2](2) (0.050-1.5 mol %) in the presence of t-BuOK. A variety of N-alkylated sulfonamides were prepared in good to excellent yields. Mechanistic investigations revealed that the key catalytic species in the present system is a sulfonylimido-bridged unsaturated diiridium complex [(Cp*lr)(2)(mu-NTs)(2)].
completely diminished the antibacterialactivity of the known sulfa drug tested, sulfamethoxazole. The sulfa-resistant MRSA strain COL also showed great susceptibility to these desamino-benzenesulfonamides. These results imply a unique mechanism of growth inhibition by these potent desamino-benzenesulfonamides, different from the well-known folate pathway target of sulfonamide antibiotics. Graphical Abstract
摘要合成了由磺酰胺组成的小型聚焦化学文库。这些化合物被设计为缺乏通常在磺酰胺抗生素中发现的对氨基苯部分。使用磁盘扩散和微量稀释试验研究了这些合成化合物对全球主要耐甲氧西林金黄色葡萄球菌(MRSA)菌株USA300(SF8300)和金黄色葡萄球菌(S. aureus)对照菌株ATCC 25923和ATCC 29213的抗菌活性。根据药敏结果,可检测到强力的金黄色葡萄球菌和MRSA USA300生长抑制剂,例如N发现具有最低抑制浓度(MIC)低至5.6μg/ cm 3的-[3,5-双(三氟甲基)苯基] -4-溴苯磺酰胺以及其他有效的磺酰胺。结构与活性的关系表明,这些脱氨基苯磺酰胺需要吸电子取代基才能有效抑制细菌病原体的生长。另外,即使当细菌叶酸合成中间体p时,它们仍具有抑制金黄色葡萄球菌菌株生长的能力。-氨基苯甲酸(PABA)被补充,而PABA补充则完全削弱了已知的磺胺药,磺胺甲恶唑的抗菌活性
BRANA, MIGUEL F.;CASTELLANO, JOSE M.;YUNTA, MARIA J. R., LIEBIGS ANN. CHEM.,(1990) N, C. 641-647
作者:BRANA, MIGUEL F.、CASTELLANO, JOSE M.、YUNTA, MARIA J. R.
DOI:——
日期:——
Simple and Versatile Catalytic System for N-Alkylation of Sulfonamides with Various Alcohols
作者:Mingwen Zhu、Ken-ichi Fujita、Ryohei Yamaguchi
DOI:10.1021/ol1002434
日期:2010.3.19
A simple and versatile catalytic system for N-alkylation of sulfonamides with various alcohols based on a catalytic hydrogen transfer reaction has been developed under a low catalyst loading of [Cp*IrCl2](2) (0.050-1.5 mol %) in the presence of t-BuOK. A variety of N-alkylated sulfonamides were prepared in good to excellent yields. Mechanistic investigations revealed that the key catalytic species in the present system is a sulfonylimido-bridged unsaturated diiridium complex [(Cp*lr)(2)(mu-NTs)(2)].
Brana, Miguel F.; Castellano, Jose M.; Yunta, Maria J. R., Liebigs Annalen der Chemie, 1990, # 7, p. 641 - 645
作者:Brana, Miguel F.、Castellano, Jose M.、Yunta, Maria J. R.