Reagent/Substituent Switching Approach for the Synthesis of Substituted 1,3,4-Oxadiazole/1,3,4-Oxadiazoline and 1,2,4-Triazole Derivatives from N-Substituted Hydrazides
作者:Trimurtulu Kotipalli、Veerababurao Kavala、Ashok Konala、Donala Janreddy、Chu-Wei Kuo、Ching-Fa Yao
DOI:10.1002/adsc.201600274
日期:2016.8.18
A metal‐free method for the synthesis of substituted 1,3,4‐oxadiazole/1,3,4‐oxadiazoline and 1,2,4‐triazole derivatives from a common starting material via reagent/substituent switching is reported. In the presence of 2‐fluoropyridine/triflic anhydride, 1,3,4‐oxadiazole derivatives were exclusively formed from N′‐tert‐butylhydrazides and 1,3,4‐oxadiazoline derivatives were produced from N‐phenylhydrazides
报道了一种无金属方法,该方法通过试剂/取代基转换从一种常见的原料合成取代的1,3,4-恶二唑/ 1,3,4-恶二唑啉和1,2,4-三唑衍生物。在2-氟吡啶/三氟甲酸酐存在下,仅由N'-叔丁基酰肼形成1,3,4-恶二唑衍生物,由N-苯基酰肼产生1,3,4-恶二唑啉衍生物。另一方面,当使用吡啶/三氟甲酸酐时,1,2,4-三唑的盐是唯一的产品。