Cobalt-Catalyzed Intramolecular C−H Amination with Arylsulfonyl Azides
作者:Joshua V. Ruppel、Rajesh M. Kamble、X. Peter Zhang
DOI:10.1021/ol702265h
日期:2007.11.1
C-H amination with arylsulfonylazides. The cobalt-catalyzed process can proceed efficiently under mild and neutral conditions in low catalyst loading without the need of other reagents or additives, generating nitrogen gas as the only byproduct. The catalytic system can be applied to primary, secondary, and tertiary C-H bonds and is suitable for a broad range of arylsulfonylazides, leading to high-yielding
Cobalt (II) complexes of porphyrins are effective catalysts for intramolecular nitrene insertion of C—H bonds with arylsulfonyl azides. The cobalt-catalyzed process can proceed efficiently under mild and neutral conditions in low catalyst loading without the need of other reagents or additives, generating nitrogen gas as the only byproduct. Using the simple tetraphenylporphyrin (TPP) as the ligand, the cobalt-catalyzed intramolecular amidation can be applied to primary, secondary, and tertiary C—H bonds and suitable for a broad range of arylsulfonyl azides, leading to the syntheses of various benzosultam derivatives in excellent yields
Intramolecular C(sp3)H amination of arylsulfonyl azides with engineered and artificial myoglobin-based catalysts
作者:Melanie Bordeaux、Ritesh Singh、Rudi Fasan
DOI:10.1016/j.bmc.2014.05.015
日期:2014.10
The direct conversion of aliphatic CH bonds into CN bonds provides an attractive approach to the introduction of nitrogen-containing functionalities in organic molecules. Following the recent discovery that cytochrome P450 enzymes can catalyze the cyclization of arylsulfonyl azide compounds via an intramolecular C(sp3)Hamination reaction, we have explored here the CH amination reactivity of other
将脂肪族 C H 键直接转化为 C N 键为在有机分子中引入含氮官能团提供了一种有吸引力的方法。最近发现细胞色素 P450 酶可以通过分子内 C(sp 3 ) H 胺化反应催化芳基磺酰叠氮化物的环化反应,我们在这里探索了 C其他血红素蛋白的 H 胺化反应。发现各种含血红素的蛋白质,特别是肌红蛋白和辣根过氧化物酶,能够催化这种转化。基于这一发现,制备了一系列分别含有活性位点突变和非天然锰原卟啉 IX 辅因子和辅原卟啉 IX 辅因子的工程化和人工肌红蛋白变体,以研究这些结构变化对催化活性和选择性的影响。催化剂。我们的研究表明,金属取代的肌红蛋白构成了可行的 CH 胺化催化剂,与合成金属卟啉对应物相比,显示出独特的反应性趋势。另一方面,发现血红素口袋水平的氨基酸取代有利于提高这些 Mb 催化反应的立体选择性和对映选择性。涉及动力学同位素效应实验的机理研究表明,C H 键断裂与肌红蛋白催化的芳基磺
US7956193B2
申请人:——
公开号:US7956193B2
公开(公告)日:2011-06-07
P450-Catalyzed Intramolecular sp<sup>3</sup> C–H Amination with Arylsulfonyl Azide Substrates
作者:Ritesh Singh、Melanie Bordeaux、Rudi Fasan
DOI:10.1021/cs400893n
日期:2014.2.7
intramolecular benzylic C-H amination reactions in a variety of arylsulfonylazide compouds. Under optimized conditions, the P450 catalysts were found to support up to 390 total turnovers leading to the formation of the desired sultam products with excellent regioselectivity. In addition, the chiral environment provided by the enzyme active site allowed for the reaction to proceed in a stereo- and enantioselective