Electrochemical Formation of Indazoles from Tropone Tosylhydrazones: Electrochemical Oxidations of Sodium Salts of Tosylhydrazones of Tropone and 2-Phenyltropone
摘要:
Electrochemical oxidations of the sodium salts of tropone and 2-phenyltropone tosylhydrazones afforded 2-tosyl-2H-indazole and 1-tosyl-7-phenyl-1H-indazole, respectively. The reactions proceeded through the cyclizations of the corresponding hydrazyl radicals generated by electrochemical one electron oxidations of the hydrazone anions.
Asymmetric Hydrogenation of α,α′-Disubstituted Cycloketones through Dynamic Kinetic Resolution: An Efficient Construction of Chiral Diols with Three Contiguous Stereocenters
Chiral diols with threecontiguousstereocenters were synthesized by a highly enantioselective ruthenium‐catalyzedasymmetric hydrogenation of racemic α,α′‐disubstituted cycloketones involving dynamic kineticresolution. This new catalytic asymmetric method provides a concise route to the alkaloid (+)‐γ‐lycorane.
Metal‐free Dehydrogenation of Substituted Cyclohexanones to Phenols
作者:Li-Jing Leng、De-Long Zhang、Liang Zhang、Xiao-Long Lin、Tian Cai、Jian-Ping Tan、Qun-Li Luo
DOI:10.1002/adsc.202300005
日期:——
The preparation of substituted phenols via a direct carbonyl desaturation is an intrinsic challenging task in modern synthetic chemistry. Herein, we develop a modular catalytic protocol for the synthesis of substituted phenols via the direct dehydrogenative aromatization of simple cyclohexanones in a metal-free manner. A broad variety of substrates bearing an assortment of functional substituent groups