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Facile routes to 1,2,4‐triazolo[3,4‐ b ][1,3,4]thiadiazines and 1,2,4‐triazino[3,4‐ b ][1,3,4]thiadiazine by heteropolyacides
Author(s) -
Motamedi Radineh,
Heravi Majid M.,
Bamoharram Fatemeh F.,
Haeri Anahita
Publication year - 2008
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570450445
Subject(s) - chemistry , medicinal chemistry , triazine , propargyl , stereochemistry , organic chemistry , catalysis
Cyclization of 4‐amino‐6‐methyl‐3‐propargylmercapto‐1,2,4‐triazine‐5‐one 3 and 4‐amino‐3‐propargyl mercapto‐1,2,4‐triazole derivatives 6 were afforded 1,2,4‐triazino[3,4‐ b ][1,3,4]thiadiazines 4 and 1,2,4‐triazolo[3,4‐ b ][1,3,4]thiadiazines 7 in presence of heteropolyacids, H 14 [NaP 5 W 29 MoO 110 ] and H 6 P 2 W 18 O 60 in high yields. Among used heteropoly acids, the yields were higher with H 14 ‐P 5 Mo, caused to their high acid strengths.