Hypervalent iodine (III)-mediated oxidation of aryl sulfonylhydrazones: A facile synthesis of N-aroyl-N′-acyl arylsulfonylhydrazides
作者:E. Ramakrishna、Kapil Dev、Saransh Wales Maurya、Ibadur Rahman Siddiqui、Rakesh Maurya
DOI:10.1016/j.tetlet.2016.12.085
日期:2017.2
We have developed a novel and efficient method for the oxidation of aryl sulfonylhydrazones to N-aroyl-N′-acyl arylsulfonylhydrazides, using hypervalentiodine (III) reagent in good yields at room temperature.
Back to basics: A transition‐metal‐free method developed for the synthesis of indazoles involves an inexpensive catalytic system composed of a diamine and K2CO3. Various (Z)‐2‐bromoacetophenone tosylhydrazones were converted into indazoles at room temperature in excellent yields (see example; Ts=p‐toluenesulfonyl). The yield was improved by photoisomerization with UV light when E/Z isomeric mixtures
简而言之:为合成吲唑而开发的一种无过渡金属的方法涉及由二胺和K 2 CO 3组成的廉价催化体系。各种(Z)-2-溴苯乙酮甲苯磺酰hydr在室温下均以优异的收率转化为吲唑(请参见示例; Ts =对甲苯磺酰基)。当使用原料的E / Z异构体混合物时,通过UV光进行光致异构化提高了产率。
A Facile Alkylation of Aryl Aldehyde Tosylhydrazones with Trialkylboranes
作者:George W. Kabalka、John T. Maddox、Ekaterini Bogas
DOI:10.1021/jo00098a008
日期:1994.9
Trialkylboranes readily alkylate aryl aldehyde tosylhydrazones to produce either the corresponding arylalkane or aryl alcohol in excellent yields.
Kabalka George W., Maddox John T., Bogas Ekaterini, J. Org. Chem, 59 (1994) N 19, S 5530- 5531
作者:Kabalka George W., Maddox John T., Bogas Ekaterini