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
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
Mechanism-Guided Design and Discovery of Efficient Cytochrome P450-Derived C–H Amination Biocatalysts
作者:Viktoria Steck、Joshua N. Kolev、Xinkun Ren、Rudi Fasan
DOI:10.1021/jacs.9b12859
日期:2020.6.10
efficient C-H aminases. Both XplA and BezE could be engineered to further improve their C-H amination reactivity, which demonstrates their evolvability for abiological reactions. These engineered and natural P450 catalysts can promote the intramolecular C-H amination of arylsulfonyl azides with over 10,000-14,000 catalytic turnovers, ranking among the most efficient nitrene transfer biocatalysts reported to
Intramolecular nitrene carbon-hydrogen insertions mediated by transition-metal complexes as nitrogen analogs of cytochrome P-450 reactions
作者:Ronald Breslow、Samuel H. Gellman
DOI:10.1021/ja00360a039
日期:1983.10
La reaction est realisee a partir d'un derive d'imidoiodobenzene obtenu par reaction du diisopropyl-2,5 benzenesulfonamide avec le diacetoxyiodobenzene
La 反应 est realisee a partir d'un 衍生 d'imidoiodobenzo obtenu par 反应 du diisopropyl-2,5 benzosulfonamide avec le diacetoxyiodobenzo
Functionalized nitrogen atom transfer catalyzed by cytochrome P-450
作者:Edmund W. Svastits、John H. Dawson、Ronald Breslow、Samuel H. Gellman