The reaction of phosgene with thiamine chloride (IIa) or nitrate (IIb) gave O-chlorocar-bonylthiamine (IX) in good yield. Treatment of IX with alkali afforded N-[1-(2-oxo-1, 3-oxathian-4-ylidene) ethyl]-N-[(2-methyl-4-amino-5-pyrimidinyl) methyl] formamide (XIII). The reaction of thiamine sodium salt (III) with aryloxycarbonyl chloride (phenoxy-, p-methyl-phenoxy, p-methoxyphenoxy) gave corresponding S-aryloxycarbonylthiamine (XIIa∼c), and further treatment of XIIa∼c with alkali afforded XIII in good yield. On the other hand, IX reacted with sodium salts of phenol, p-cresol, and p-methoxyphenol to give corresponding O-aryloxycarbonylthiamine (XIa∼c). Treatment of XIa∼c with alkali also gave XIII in low yield. Therefore, it was assumed that XI and XII gave XIII in independent way by alkali treatment.
光气与
氯化硫胺(IIa)或
硝酸硫胺(IIb)反应,可以得到 O-
氯羰基硫胺(IX),收率很高。用碱处理 IX,可得到 N-[1-(2-氧代-1,3-氧
硫杂-4-亚基)乙基]-N-[(2-甲基-4-
氨基-5-
嘧啶基)甲基]甲酰胺(XIII)。
硫胺素钠盐(III)与芳氧基羰酰
氯(苯氧基、对
甲氧基苯氧基、对
甲氧基苯氧基)反应得到相应的 S-芳氧基羰基硫胺(XIIa∼c),XIIa∼c 进一步用碱处理得到 XIII,收率很高。另一方面,IX 与
苯酚、
对甲酚和对
甲氧基苯酚的钠盐反应,得到相应的 O-芳氧基羰基硫胺(XIa∼c)。用碱处理 XIa∼c 还能得到产量较低的 XIII。因此,假定 XI 和 XII 通过碱处理以独立的方式生成 XIII。