I-69 Intermolecular and intramolecular cycloaddition reactions of 1-ethyl-1,2,4-triazinium salts with alkynes [Electronic resource] / N. N. Mochul`skaya, A. A. Andreiko, V. N. Charushin, V. I. Solomonov // Mendeleev Communications. - 2001. - Vol. 11, № 1. - P19-20 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Azomethyne ylides generated from 3-alkylthio substituted 1-alkyl-5-aryl-1,2,4-triazinium salts 4a–c on treatment with triethylamine undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate to give pyrrolo[2,1-f] [1,2,4]triazines, while 1-ethyl-5- phenyl-1,2,4-triazinium salts 1a,b bearing the CC bond in the side-chain 3-alkynylthio substituent react with acetylenes to undergo either intermolecular 1,3-dipolar cycloaddition or intramolecular inverse electron demand Diels–Alder reactions???? \\\\expert2\\nbo\\Mendeleev Communications\\2001, v.11, N 1. p.19.pdf |