Iodine-Catalyzed Diazenylation with Arylhydrazine Hydrochlorides in Air
作者:Dinesh S. Barak、Shashikant U. Dighe、Ilesha Avasthi、Sanjay Batra
DOI:10.1021/acs.joc.7b03149
日期:2018.4.6
A mildapproach to diazenylation of active methylene compounds and N-heterocyclic compounds with arylhydrazine hydrochlorides in the presence of iodine under basic aerobic conditions was developed. The reaction could be executed either under heating or in the presence of blue LED light, though the latter condition was found to be relatively efficient. Presumably, the aryldiazene produced by oxidation
The reaction of ethyl benzoylacetate with malononitrile: a novel synthesis of some pyridazine, pyridazino[2,3- a ]quinazoline and pyrrole derivatives
作者:Fathy M Abdelrazek、Abdellatif M Salah El-Din、Ahmed E Mekky
DOI:10.1016/s0040-4020(00)01153-4
日期:2001.2
and coupled with diazonium salts to afford azo derivatives. These azo derivatives and those of ethyl benzoylacetate could be cyclized into 4-oxo-, 6-oxo- and 6-iminopyridazines and pyridazino[2,3-a]quinazolines, respectively. The 6-iminopyridazines could be transformed into the 6-oxopyridazines. The imino- and oxopyridazines could be transformed into pyrrole derivatives.
苯甲酰乙酸乙酯与丙二腈进行克莱森缩合反应,得到2-氰基-5-苯基-3,5-二氧杂戊腈,可以将其环化成2-氨基吡喃,并与重氮盐偶联,得到偶氮衍生物。这些偶氮衍生物和苯甲酰乙酸乙酯的那些可以分别环化成4-氧代,6-氧代和6-亚氨基哒嗪和哒嗪并[2,3- a ]喹唑啉。可以将6-亚氨基哒嗪转化为6-氧代哒嗪。亚氨基和氧并哒嗪可转化为吡咯衍生物。
Photoisomerisation d'arylhydrazones-2 de dicetones-1,2 substituees en 2.
作者:R. Pichon、J. Le Saint、P. Courtot
DOI:10.1016/s0040-4020(01)92091-5
日期:1981.1
A syn-anti photoisomerisation of the carbon-nitrogendoublebond is responsible for the photochromic properties observed with 2-arylhydrazones of 2-substituted 1,2-diketones. We have determined the multiplicity of the excited state involved in the process and we have shown that, in the thermal back-reaction, syn-anti isomerisation takes place through rotation around the CN bond rather than through