Acetals of lactams and acid amides. 39. Synthesis of three-ring derivatives of pyrido [l,2-a] pyrimidines on the basis of the reaction of dimethylformamide acetal with dicyanomethylenecycloalkanes
Acetals of lactams and acid amides. 39. Synthesis of three-ring derivatives of pyrido [l,2-a] pyrimidines on the basis of the reaction of dimethylformamide acetal with dicyanomethylenecycloalkanes
Improved Synthesis of Mono- and Disubstituted 2-Halonicotinonitriles from Alkylidene Malononitriles
作者:Ashley R. Longstreet、Brian S. Campbell、B. Frank Gupton、D. Tyler McQuade
DOI:10.1021/ol4025265
日期:2013.10.18
with 2,3,4 and/or 5 substitution remain challenging to prepare. Existing strategies to form multisubstituted 2-halonicotinonitriles via enamines suffer from dimerization of the starting alkylidenemalononitriles resulting in low yields. Through alteration of reaction conditions, a new high yielding method into enamines was realized by condensing DMF–DMA and alkylidenemalononitriles in the presence of
Acetals of lactams and acid amides. 42. Cyclization of dienamino esters, dienamino nitriles, and acylamidines to pyridine derivatives
作者:N. I. Smetskaya、N. A. Mukhina、V. G. Granik
DOI:10.1007/bf00508675
日期:1984.6
Acetals of lactams and acid amides. 39. Synthesis of three-ring derivatives of pyrido [l,2-a] pyrimidines on the basis of the reaction of dimethylformamide acetal with dicyanomethylenecycloalkanes
作者:V. G. Granik、N. I. Smetskaya、N. A. Mukhina、I. V. Persianova、V. G. Klimenko