An unexpected transformation of 3,4-bis(isocyanato)furoxan into 3,3’-bi(1,2,4-oxadiazol-5-one)
摘要:
A transformation of 3,4-bis(isocyanato)furoxan into 3,3'-bi(1,2,4-oxadiazol-5-one) by the action of water was unexpectedly found. The structure of the product was established by spectroscopic and X-ray methods; a mechanism of the transformation is suggested.
A convenient preparative method was developed for the synthesis of 4-amino-3-furoxancarboxylic acid azide, which is a universal synthon for the preparation of functional furoxan derivatives. This method was used for preparing new azo-, azoxy-, azido-, cyano-, nitro-, carbonylamino-, and hydroxylamino-substituted furoxan derivatives, which have earlier been difficultly accessible.
The First Synthesis of Furoxan and 1,3,4-Oxadiazole Ring Ensembles
作者:Aleksey O. Finogenov、Alexander S. Kulikov、Margarita A. Epishina、Igor V. Ovchinnikov、Yu. V. Nelyubina、Nina N. Makhova
DOI:10.1002/jhet.1048
日期:2013.1
Previously unknown furoxan and 1,3,4‐oxadiazole ringensembles incorporating two, three, and five furoxan and 1,3,4‐oxadiazole rings in different combinations were for the first time synthesized from accessible azides and hydrazides of furoxancarboxylic acids. An interdependence of furoxan and 1,3,4‐oxadiazole rings on their geometric parameters was revealed by the X‐ray diffraction method.