6-Acyl- (15, 17) and 6-ethoxycarbonyl-5-substituted 1,2,4-triazines (11) were prepared by refluxing acylhydrazones (10, 14) or N,N-dimethylaminomethylenehydrazones (16) with ammonium acetate in acetic acid. NMR-studies confirmed the high regio selectivity of this procedure.
Formation of germanium–nitrogen double bonds in reactions of the electron-rich germylene bis[bis(trimethylsilyl)amido]germanium(<scp>II</scp>) with a range of diazo-compounds
作者:Christopher Glidewell、Douglas Lloyd、Keith W. Lumbard
DOI:10.1039/dt9870000501
日期:——
The electron-richgermylene Ge[N(SiMe3)2]2 reacts with the diazo-compounds R1CH2COC(N2)R2[R1= H, R2= CO(OEt), SO2C6H4Me-p, or COPh; R1, R2=–CMe2CH2C(O)–], which contain an enolisable function, to yield the heterocycles [graphic omitted]; the weakly acidic diazo-compounds ethyl diazoacetate and diazoacetophenone yield bis-adducts Ge[N(SiMe3)2]2[C(N2)COR][NHNC(H)COR](R = OEt or Ph). Diazo-compounds containing