Studies on 3-substituted 1,2-benzisoxazole derivatives. I.
作者:HITOSHI UNO、MIKIO KUROKAWA、KAGAYAKI NATSUKA、YUZURU YAMATO、HARUKI NISHIMURA
DOI:10.1248/cpb.24.632
日期:——
3-Amidinomethyl- (8), 3-imidazolinylmethyl- (9) and 3-tetrahydropyrimidinylmethyl-1, 2-benzisoxazole (10) were synthesized from 1, 2-benzisoxazole-3-acetonitrile (4) via iminoether (7). 3-Tetrazolylmethyl-1, 2-benzisoxazole (5) and 1, 2-benzisoxazole-3-acetamide oxime (11) were also prepared from 4. 3-Aminoethyl-1, 2-benzisoxazole (25), a tryptamine analogue of 1, 2-benzisoxazole, was synthesized from 3-chloroethyl-1, 2-benzisoxazole (20). The bromination of 1, 2-benzisoxazole-3-acetic acid (1) with one molar equivalent of bromine afforded α-bromo-1, 2-benzisoxazole-3-acetic acid (27), which was decarboxylated to give 3-bromomethyl-1, 2-benzisoxazole (30). The amination of 30 afforded 3-amino-methyl-1, 2-benzisoxazole (31). The bromination of 1 with excess of bromine gave 3-tribromomethyl-1, 2-benzisoxazole (28). N-Substituted 1, 2-benzisoxazolylglycine ester (32) was synthesized from methyl α-bromo-1, 2-benzisoxazole-3-acetate (29) which was obtained by the bromination of methyl 1, 2-benzisoxazole-3-acetate (2).
3-氨基氨基甲基-(8),3-咪唑啉基甲基-(9)和3-四氢吡啶基甲基-1, 2-苯异噁唑(10)是通过亚胺醚(7)从1, 2-苯异噁唑-3-乙腈(4)合成的。3-四唑基甲基-1, 2-苯异噁唑(5)和1, 2-苯异噁唑-3-乙酰胺肟(11)也由4合成。3-氨基乙基-1, 2-苯异噁唑(25),是1, 2-苯异噁唑的色氨酸类似物,是通过3-氯乙基-1, 2-苯异噁唑(20)合成的。1, 2-苯异噁唑-3-乙酸(1)与等量的溴进行溴化反应生成α-溴-1, 2-苯异噁唑-3-乙酸(27),后者去羧化得到3-溴甲基-1, 2-苯异噁唑(30)。将30进行氨基化得到3-氨基甲基-1, 2-苯异噁唑(31)。用过量溴对1进行溴化反应生成3-三溴甲基-1, 2-苯异噁唑(28)。N-取代的1, 2-苯异噁唑基甘氨酸酯(32)是通过溴化甲基-1, 2-苯异噁唑-3-乙酸酯(29)合成的,后者是通过对甲基-1, 2-苯异噁唑-3-乙酸酯(2)进行溴化获得的。