Sulfur Nitride in Organic Chemistry. Part 19. Selective Formation of Benzo- and Benzobis[1,2,5]thiadiazole Skeleton in the Reaction of Tetrasulfur Tetranitride with Naphthalenols and Related Compounds
Tetrasulfur tetranitride (N4S4) reacted with 2-naphthols to afford naphtho [1,2-c][1,2,5] thiadiazoles (13) in high yields, while 1-naphthaols gave naphtho[1,2-c:3,4-c′]bis[1,2,5]thiadiazoles as a ...
Ring fused 1,2,5-thiadiazoles from oximes and trithiazyl trichloride
作者:Charles W. Rees、Tai-Yuen Yue
DOI:10.1039/b106384g
日期:2001.10.11
Trithiazyl chloride 1 converts the oximes of simple cyclic ketones into fused 1,2,5-thiadiazoles and bis-1,2,5-thiadiazoles in mild one-pot reactions. Cyclopentanone oxime gives the bisthiadiazole 3 (20%) in which all four methylene groups have been functionalised. Indan-1-one oxime 4 gives the thiadiazole 5 (63%), and tetralone oximes 6 and 8 give the bisthiadiazole 7 in low yields (20%) in complex reactions. Benzosuberone oxime 11 however gives only the monothiadiazole 12 (30%) which is not converted further with more trimer 1. These
reactions probably occur by mechanisms analogous to those proposed earlier for the conversion of alkenes, alkynes, active methylene compounds and enamines into 1,2,5-thiadiazoles. Bisthiadiazole 3, a reactive analogue of fluorene, condenses with p-anisaldehyde to give 13 and is oxidised by PCC to the fluorenone analogue 15 in low yield; 15 is formed directly from cyclopentane-1,3-dione with trimer 1. Ketone 15 condenses with malononitrile and Hünig's base to give the dicyanomethylene derivative 17 (94%) which forms a black metallic 1 ∶ 1 complex with TTF at room temperature.