Chemistry of Chiral Vitamin B<sub>6</sub>Analogs. IV. Syntheses of Chiral Pyridoxal and Pyridoxamine Analogs Having a Branched “Ansa Chain” between 2′- and 5′-Positions
作者:Makoto Ando、Yoji Tachibana、Hiroyoshi Kuzuhara
DOI:10.1246/bcsj.55.829
日期:1982.3
Racemic 15-formyl-14-hydroxy-5,5-dimethyl-2,8-dithia[9](2,5)pyridinophane (4), an analog of pyridoxal having a branched “ansa chain” between 2′- and 5′-positions, was synthesized from 2,5-bis(chloromethyl)-3-hydroxy-O,O′-isopropylidene-4-pyridinemethanol. Optical resolution of 4 was achieved via the formation of Schiff base with 3-amino-3-deoxy-1,2:5,6-di-O-isopropylidene-D-glucofranose, giving the
外消旋 15-甲酰基-14-羟基-5,5-二甲基-2,8-二硫杂 [9](2,5)pyridinophane (4),吡哆醛的类似物,在 2'- 和 5 之间具有支链“安萨链” '-位,由 2,5-双(氯甲基)-3-羟基-O,O'-异亚丙基-4-吡啶甲醇合成。4 的光学拆分是通过与 3-氨基-3-脱氧-1,2:5,6-二-O-异亚丙基-D-葡聚糖形成席夫碱实现的,得到 4 的左旋对映异构体 (4a)。外消旋 15-氨基甲基-14-羟基-5,5-二甲基-2,8-二硫杂[9](2,5)吡啶烷 (5),与 4 相同类型的吡哆胺类似物,其左旋对映异构体由对应 4 和 4a。5 的左旋和右旋对映异构体也通过外消旋体的旋光拆分得到 5 的手性二苯甲酰基酒石酸盐。