Heterocyclic studies. Part XIII. Ready ring cleavage of some pyrimidine derivatives to give highly substituted ethylenes
作者:Jim Clark、I. Gelling、I. W. Southon、M. S. Morton
DOI:10.1039/j39700000494
日期:——
Treatment of 6-chloro-4-dialkylamino-5-nitropyrimidines (Ia–d) under acidic conditions resulted in ringcleavage and formation of 3-amino-3-dialkylamino-2-nitroacrylonitriles (IIIa–d). Similar treatment of 4-amino- or 4-alkylamino-6-chloro-5-nitropyrimidines also gave acrylonitriles (IIIe–i) but 4-amino- or 4-alkylamino-5-nitropyrimidin-6(1H)-ones (IIe–i) were formed at the same time.
Clark,J. et al., Journal of the Chemical Society. Perkin transactions I, 1976, p. 1004 - 1007
作者:Clark,J. et al.
DOI:——
日期:——
CLARK J.; PARVIZI B.; COLMAN R., J. CHEM. SOC. PERKIN TRANS., PART 1 <JCPK-BH>, 1976, NO 9, 1004-1007
作者:CLARK J.、 PARVIZI B.、 COLMAN R.
DOI:——
日期:——
An efficient one-pot synthesis of 6-alkoxy-8,9-dialkylpurines via reaction of 5-amino-4-chloro-6-alkylaminopyrimidines with N,N-dimethylalkaneamides and alkoxide ions
作者:Pier Giovanni Baraldi、Asier Unciti Broceta、Maria Josè Pineda de las Infantas、Juan Josè Dı̀az Mochun、Antonio Espinosa、Romeo Romagnoli
DOI:10.1016/s0040-4020(02)00867-0
日期:2002.9
ines has been accomplished by the cyclization of the corresponding intermediate 5-amino-4-chloro-6-(alkylamino)pyrimidines promoted by alkoxides and various N,N-dimethyl amides, where the latter act as solvent–reagents. By this three-component condensation reaction we are able to introduce an alkyl group in the 8 position of the purine ring with the concomitant nucleophilic replacement of the 6-chloro