The reactions of glycosyl isothiocyanates (1a-c) with diazomethane or ethyl diazoacetate gave the corresponding glycosylamino-1, 2, 3-thiadiazoles (2a-c or 3a, b). Attempted ring transformation of 2 under thermal or basic conditions failed. Similar treatment of D-gluconyl isothiocyanate (1d) with diazomethane afforded D-gluco-pent-1-yl oxathiazolone (5d) in good yield. The reactions of 1a-c with acetoamidine or formamidine hydrochloride under basic conditions gave the corresponding N-glycosyl-N'-acetoamidino-or N-glycosyl-N'-formamidinothiocarboxamides (6a-c ; 7a, c). Subsequent treatment of 6b, c and 7a, c with thionyl chloride under basic conditions afforded the corresponding 1, 2, 4, 6-thiatriazine-S-oxide glycosides (8a-c ; 9a, c) in good yields. Attempted transformation of 8 to 1, 2, 4-triazole glycoside (10) was unsuccessful.
糖基异
硫氰酸酯(1a-c)与
重氮甲烷或
重氮乙酸乙酯反应,得到相应的糖基
氨基-1,2,3-
噻二唑(2a-c 或 3a,b)。试图在热或碱性条件下对 2 进行环转化的努力失败了。用
重氮甲烷对异
硫氰酸 D-葡糖基酯(1d)进行类似的处理,可以得到
D-葡糖戊-1-基噁
硫唑酮(5d),收率很高。在碱性条件下,1a-c 与
乙脒或
甲脒盐酸盐反应,得到相应的 N-糖基-N'-
乙脒或 N-糖基-N'-
甲脒硫代羧酰胺(6a-c;7a,c)。随后,在碱性条件下用亚
硫酰氯处理 6b, c 和 7a, c,可以得到相应的 1, 2, 4, 6-噻三嗪-S-氧化物苷(8a-c;9a, c),收率很高。将 8 转化为 1,2,4-三唑苷(10)的尝试没有成功。