Efficient oxidative cyclization of <i>N</i>-acylhydrazones for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles using <i>t</i>-BuOI under neutral conditions
作者:Peng Gao、Yunyang Wei
DOI:10.1515/hc-2012-0179
日期:2013.4.1
in situ from t-BuOCl and NaI. A variety of 2,5-disubstituted1,3,4-oxadiazoles were synthesized in high yields within short reaction time. The method is also suitable for cyclization of N-acylhydrazones derived from heterocyclic aldehydes and aliphatic aldehydes. Mild reaction conditions and simple workup operations make the procedure a good alternative for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles
Lewis Acid–Mediated Nucleophilic Addition of Dialkylphosphite to C=N Double Bond of Hydrazones
作者:Chia-Ling Lien、Shu-Hua Yeh、Chi-Tung Hsu
DOI:10.1080/10426500802466973
日期:2009.3.10
The synthesis of new phenyl substituted derivatives ( 2) of α -hydrazino-alkylphosphonic acids by Lewis acid–mediated addition of dialkylphosphite to hydrazones, derived from benzoylhydrazines and benzaldehydes, is described. Reactions were successfully promoted by borontrifluoride etherate under mild conditions in methylene chloride at room temperature.
A facile catalytic one-pot synthesis of N-acylhydrazones via acceptorless dehydrogenativecoupling of readily available alcohols and benzohydrazides (R2CONHNH2) using arene ruthenium (II) complexes has been described. The coupling of alcohols with various benzohydrazides using ruthenium catalysts provide a wide range of N-acylhydrazones in good to excellent yields (63–93%; 32 examples). The present
已经描述了使用芳烃钌 (II) 配合物通过容易获得的醇和苯并酰肼 (R 2 CONHNH 2 ) 的无受体脱氢偶联,轻松催化一锅法合成N-酰基腙。使用钌催化剂将醇与各种苯并酰肼偶联提供了广泛的N-酰基腙具有良好至极好的收率(63–93%;32 个例子)。本协议提供了高选择性的腙,没有任何烷基化产物,并耐受一系列官能团。对照实验表明,该机制通过醇的无受体脱氢进行,氢和水是唯一的副产物。克级合成说明了本策略的有用性。
10.2174/157017861466617081115
作者:Khan, P. Rasvan、Durgaprasad、Reddy, S. Gopal、Reddy, G. Raveendra、Hussein, Ibnelwaleed A.、Reddy, B.V. Subba