Synthesis of 2,5-distributed 3,3,4,4-tetracyanopyrrolidines

The reaction of 1,1,2,2-tetracyanoethane with 1-R,3-R,5-R-2,4-diazapenta-1, 4-dienes leads to 2,5-disubstituted 3,3,4,4-tetracyanopyrrolidines. The conditions for the acylation of the last were selected.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 353–358, March, 1994.     

Reaction of 3,3,4,4-tetracyanopyrrolidines with primary alcohols and amines

2,5-Substituted 3,3,4,4-tetracyanopyrrolidines react with primary alcohols in the presence of an excess of a base or with the base itself. 2-(N-Arylideneamino)-5-alkoxy-3,4-dicyanopyrroles are formed as a result of the reactions with alcohols, and 2,5-diamino-1-R-3,4-dicyanopyrroles are formed as the result of the reaction with primary aliphatic amines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1502–1507, November, 1991.     

Reaction of quinoxaline with benzopyridines in acetic anhydrides in the presence of Zn dust

The reaction between quinoxaline and benzopyridine in acetic anhydride in the presence of zinc dust gives a quinoxaline anion and a benzopyridine N-acetyl radical, which recombine to give the previously unknown N-acetyl dihydrobenzo-pyridine derivative of 1,2-dihydroquinoxaline. Under these conditions, quinoxaline alone gives 1,4-diacetyl-1,4-dihydroquinoxaline and 1-acetyl-2-(1,2-dihydroquinoxalyl-2)-1,2-dihydroquinoxaline.Previous communication, [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 967–973, July, 1985.     

Reactions of Phosphorodiamidous Acid Esters with α-Halocarbonyl Compounds

Reactions of ethyl and tert-butyl phosphorodiamidites with chloroacetone, bromoacetone, and -chloroethyl acetate were studied. The reaction pathway is determined by the structure of the intermediate quasiphosphonium compound responsible for the formation of the Arbuzov product as well as for the occurrence of the amonalous reaction yielding vinyl phosphate.     

Glucomannan from Narcissus poeticus Studied by PMR and 13C NMR Spectroscopy

Native acetylated glucomannan of molecular weight (MW) 32000 with a glucose:mannose ratio 1:30 was isolated from bulbs of Narcissus poeticus. Glucomannan was depolymerized to a fragment of MW 15000 with an unchanged primary structure and was studied using PMR and ¹³C NMR spectroscopy. It was found that the linear chain of the biopolymer consists of 1-4-bound D-gluco- and D-mannopyranose units and the O-Ac groups are localized on C-2, C-3, and C-6 hydroxyls in certain anhydromannose units.