Sphingolipids and Glycerolipids. Part II. Syntheses of Two Pairs of Enantiomeric C18-Sphingosines and a Palmitoyl Analogue of Gaucher Spleen Glucocerebroside.
作者:Hirotaka SHIBUYA、Keiko KAWASHIMA、Norihiko NARITA、Masahiko IKEDA、Isao KITAGAWA
DOI:10.1248/cpb.40.1154
日期:——
Sixteen kinds of chiral C4-epoxides [(-)-10a-d, (+)-10a-d, (-)-11a-d, (+)-11a-d], which are synthons in our synthetic strategy for complex lipids, have been prepared from (2Z)-2-butene-1, 4-diol (6) by employing a Sharpless asymmetric epoxidation. By using the chiral C4-epoxides [(+)-10a, (-)-10a, (-)-11a, (+)-11a] as starting compounds, two pairs of enantiomeric (D-erythro, L-erythro, D-threo, and L-threo)-C18-sphingosines (1, 2, 3, 4) have been synthesized via a regioselective ring-opening of the epoxide ring with azide anion followed by reduction of the azide group to an amino group and a Wittig reaction. Furthermore, D-erythro-C18-sphingosine (1) has been converted to a palmitoyl analogue (5a) of Gaucher spleen glucocerebroside (5) through a reaction pathway including successive condensations with palmitic acid and D-glucose.
已合成十六种手性C4-环氧化物 [(-)-10a-d, (+)-10a-d, (-)-11a-d, (+)-11a-d],这些化合物是我们合成复杂脂质策略中的合成子,通过使用Sharpless不对称环氧化反应,从(2Z)-2-丁烯-1, 4-二醇(6)制备而成。利用手性C4-环氧化物 [(+)-10a, (-)-10a, (-)-11a, (+)-11a] 作为起始化合物,通过环氧环的区域选择性开环反应与叠氮阴离子结合,随后将叠氮基团还原为氨基,并进行Wittig反应,合成了两对对映异构体(D-赤藓糖,L-赤藓糖,D-反式,L-反式)C18-鞘氨醇(1, 2, 3, 4)。此外,D-赤藓糖-C18-鞘氨醇(1)通过与棕榈酸和D-葡萄糖的连续缩合反应途径转化为高雪氏脾脏葡萄糖苷脂(5)的棕榈酰类似物(5a)。