TEMPO-Mediated Aliphatic C–H Oxidation with Oximes and Hydrazones
摘要:
A method for aliphatic C-H bond oxidation of oximes and hydrazones mediated by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) has been developed, which enables the concise assembly of substituted isoxazole and pyrazole skeletons.
TEMPO-Mediated Aliphatic C–H Oxidation with Oximes and Hydrazones
摘要:
A method for aliphatic C-H bond oxidation of oximes and hydrazones mediated by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) has been developed, which enables the concise assembly of substituted isoxazole and pyrazole skeletons.
feasible in many cases. The energy transfer (EnT) E/Z-photoisomerization might yield the Z-isomers. In this work, CBZ6 was proven to be an EnT photocatalyst for the E → Z-isomerization of C–C or C–N double bonds. The transformations of in situ generated Z-isomers of oximes and stilbenes consequently afforded the desired reversed Beckmannrearrangement products and phenanthrenes, respectively.
考虑到化学选择性的区域选择性, Z-异构体和E-异构体的反应通常是不同的。 Z-异构体的合成在许多情况下是不可行的。能量转移 (EnT) E / Z光异构化可能会产生Z异构体。在这项工作中, CBZ6被证明是一种用于 C-C 或 C-N 双键E → Z异构化的 EnT 光催化剂。原位生成的肟和茋的Z-异构体的转化因此分别提供了所需的反向贝克曼重排产物和菲。
TEMPO-Mediated Aliphatic C–H Oxidation with Oximes and Hydrazones
A method for aliphatic C-H bond oxidation of oximes and hydrazones mediated by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) has been developed, which enables the concise assembly of substituted isoxazole and pyrazole skeletons.