Ring opening in di[1,2,3]triazolo-[1,3,6]thiadiazepine and -[3,1,5]benzothiadiazepine in reactions with butyllithium
摘要:
Di[1,2,3]triazolo[1,5-a:5',1',-d][3,1,5]benzothiadiazepine treated with butyllithium undergoes ring opening via the thiophilic addition of butyllithium at the C-S bond, whereas 9,10-dihydrodi[1,2,3]triazolo[1,5-b:5',1'-f][1,3,6]thiadiazepine mainly undergoes lithiation of the methylene group followed by C-N bond cleavage to give 1-vinyltriazolyl sulfide.
First synthesis of bis[1,2,3]triazolo[1,5-b;5′,1′-f][1,3,6]thiadiazepine derivatives by [2+1] condensation of 1,2,3-thiadiazoles with vicinal diamines
作者:Natalya N. Volkova、Evgeniy V. Tarasov、Vasiliy A. Bakulev、Wim Dehaen
DOI:10.1039/a907527e
日期:——
Novel bistriazolo[1,3,6]thiadiazepine derivatives have been prepared by the base-catalyzed condensation of aromatic and aliphatic 1,2-diamines with 5-chloro-1,2,3-thiadiazoles, via a multistep process which is thought to involve two Dimroth rearrangements and subsequent loss of hydrogen sulfide by intramolecular nucleophilic substitution.