Syntheses of 7-Alkyl-1,3,6-trimethylpyrrolo(2,3-d)pyrimidines and 4-Alkylamino-2,5-dimethyl-2,3-dihydrofuro(3,2-e)pyrimidines.
作者:Ichiro ISHIKAWA、Victor E. KHACHATRIAN、Raphael G. MELIK-OHANJANIAN、Norio KAWAHARA、Yoshihisa MIZUNO、Haruo OGURA
DOI:10.1248/cpb.40.846
日期:——
7-Alkyl-1, 3, 6-trimethylpyrrolo[2, 3-d]pyrimidine-2, 4(1H, 3H)-diones were readily synthesized by treatment of 6-alkylamino-5-allyl-1, 3-dimethyluracils, which were derived from 5-allyl-6-chloro-1, 3-dimethyluracil and alkylamines, with bis(acetonitrile) palladium (II) chloride. In addition, 4-alkylamino-2, 5-dimethyl-2, 3-dihydrofuro[3, 2-e]pyrimidin-6-ones were easily synthesized by treatment of 5-allyl-6-chloro-1-methyluracil with alkylamines.
A practical approach for spiro- and 5-monoalkylated barbituric acids
作者:Palwinder Singh、Kamaldeep Paul
DOI:10.1002/jhet.5570430313
日期:2006.5
substituted/-unsubstituted barbituric acids with various alkyldihalides under phase transfer catalytic conditions using DMF-K2CO3 (base), TBAHSO4 (catalyst) provide spirobarbituric acids in moderate to high yields. Irrespective of the existence of C5-monoalkylated compounds in the enolic form (confirmed by the isolation of some of its analogues), the second alkylation predominantly takes place at C5. The underlying