Synthesis of a New Tricyclic Compound, 5H-2-Methoxycarbonyl-4-oxofuro(2,3-b)(1,5)benzothiazepine.
作者:Katsumi YAMAMOTO、Jyunichi KOYANAGI、Ikuko HORIE、Masayuki OGAWA、Katsuya SAKUMA、Akira TANAKA
DOI:10.1248/cpb.43.2064
日期:——
Methyl 5-(2-carboxyphenylthio)-2-furancarboxylate (2) was obtained by the nucleophilic substitution of methyl 5-nitro-2-furancarboxylate (3) with the disodium salt of thiosalicylic acid, and chlorination of 2 gave methyl 5-(2-chloroformylphenylthio)-2-furancarboxylate (4). The reaction of 4 with sodium azide gave methyl 5-(2-azidocarbonylphenylthio)-2-furancarboxylate (8) and methyl 5-(2-isocyanatophenylthio)-2-furancarboxylate (9) was obtained by the thermolysis of 8. Finally, the new tricyclic compound, 5H-2-methoxycarbonyl-4-oxofuro[2, 3-b][1, 5]benzothiazepine (1) was obtained by cyclization of 9 in the presence of aluminum chloride.
甲基5-(2-羧基苯硫)-2-呋喃羧酸酯(2)是通过甲基5-硝基-2-呋喃羧酸酯(3)与硫水杨酸的双钠盐的亲核取代反应获得的,对2进行氯化得到甲基5-(2-氯甲酰苯硫)-2-呋喃羧酸酯(4)。4与叠氮钠的反应生成甲基5-(2-叠氮基羰基苯硫)-2-呋喃羧酸酯(8),而通过对8进行热解得到甲基5-(2-异氰酸基苯硫)-2-呋喃羧酸酯(9)。最后,在氯化铝存在下,通过9的环化反应获得了新型三环化合物5H-2-甲氧基羧基-4-氧-呋喃[2, 3-b][1, 5]苯噻嗪(1)。