A Rapid and Convenient Method for Preparing Acylhydrazines from Acyldiazenes
作者:Jian-Ping Li、Shu-Qiang Yu、Gui-Rong Qu、Yu-Lu Wang
DOI:10.1002/jccs.200400125
日期:2004.8
hydrazine hydrate as the reductant to hydrogenate acyldiazenes is reported. Twelve acylhydrazines have been synthesized from acyldiazenes in excellent yields under mild conditions. This method is rapid, convenient, and efficient.
A New Method for the Synthesis of Acyl-diazenes Using NaNO<sub>2</sub>-Ac<sub>2</sub>O
作者:Jian-Ping Li、Ping Liu、Wan-Xin Xue、Yu-Lu Wang
DOI:10.1002/jccs.200300067
日期:2003.6
An efficient and convenient method for the synthesis of acyl-diazenes from acylhydrazines using NaNO 2 -acetic anhydride as a novel oxidant agent is reported. The reaction gives excellent yields and the reaction time is not long.
(PBu3)-promoted annulation reaction at room temperature. In this synthetic process, crude less stable N-aroyldiazene intermediates generated by I2-mediated oxidation of hydrazides were used directly in a subsequent annulation reaction to afford the selenadiazole products. The merits of the present synthetic strategy also include absence of transition metals and gram-scale synthesis.
2-亚氨基-1,3,4-硒二唑衍生物可以在室温下通过连续氧化和三丁基膦 (PBu 3 ) 促进的环化反应从酰肼和异硒氰酸酯合成。在该合成过程中,由 I 2 -介导的酰肼氧化产生的较不稳定的粗N-芳酰基二氮中间体直接用于随后的环化反应,以提供硒二唑产物。本合成策略的优点还包括没有过渡金属和克级合成。
Activation of Molecular Oxygen into Hydrogen Peroxide via α-Azobenzyl Hydroperoxide. A Generation of Hydrogen Peroxide from Organic Hydroperoxide by the Amine-base Catalyzed Reaction
作者:Takahiro Tezuka、Takashi Otsuka
DOI:10.1246/cl.1988.1751
日期:1988.10.5
Hydrogenperoxide is generated together with nitrile imine from α-azobenzyl hydroperoxide, which is formed readily by autooxidation of arylaldehyde hydrazone, via peroxycarboximidic acid by the amine-base catalyzed reaction in benzene. This provides a new type of activation reaction of molecular oxygen into hydrogenperoxide by aldehyde hydrazone.