A method for preparative production of 3β,20S-dihydroxydammar-24-en-12-one 3,20-di-O-β-D-glucopyranoside (1), a glycoside from Panax japonicus, chikusetsusaponin-LT8 was developed. Chemical transformation of betulafolientriol, a component of Betula leaves extract, produced the 12-keto-20S-protopanaxadiol (3β,20S-dihydroxydammar-24-en-12-one) (2), exhaustive glycosylation of which by 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosylbromide (3) under Koenigs—Knorr reaction conditions with subsequent removal of protecting groups formed 3β,20S-dihydroxydammar-24-en-12-one 3,20-di-O-β-D-glucopyranoside (1). The principal glycosylation product was 3β,20S-dihydroxydammar-24-en-12-one 3-O-β-D-glucopyranoside if equimolar amounts of (2) and (3) were used.
一种制备3β,20S-二羟基达玛烯-24-酮3,20-二-O-β-
D-葡萄糖苷(1)的工艺被开发出来,该化合物是来自日本人参的糖苷,名为筑雪
皂苷-LT8。通过对白桦叶
提取物成分
白桦醇三醇进行
化学转化,得到12-酮-20S-
原人参二醇(3β,20S-二羟基达玛烯-24-酮)(2)。在Koenigs—Knorr反应条件下,用2,3,4,6-四-O-乙酰基-α-
D-葡萄糖苷
溴化物(3)对其进行彻底的糖苷化,随后去除保护基团,形成3β,20S-二羟基达玛烯-24-酮3,20-二-O-β-
D-葡萄糖苷(1)。如果使用等摩尔的(2)和(3),主要的糖苷化产物是3β,20S-二羟基达玛烯-24-酮3-O-β-
D-葡萄糖苷。