Etoposide: a new approach to the synthesis of 4-O-(2-amino-2-deoxy-4,6-O-ethylidene-β-d-glucopyranosyl)-4′-O-demethyl-4-epipodophyllotoxin
作者:Cenek Kolar、Konrad Dehmel、Heinz Wolf
DOI:10.1016/0008-6215(90)80062-8
日期:1990.10
chloroacetyl groups from 12 beta, its alpha analogue 12 alpha, and 15 beta gave the 4-O-(2-benzyloxycarbonylamino-2-deoxy-4,6-O-ethylidene-alpha-(17 alpha) and -beta-D-glucopyranosyl)-4'-O-demethyl-epipodophyllotoxins (17 beta and 20 beta), respectively. Hydrogenolysis of the benzyloxycarbonyl groups then gave 4-O-(2-amino-2-deoxy-4,6-O-ethylidene-alpha- (18 alpha) and -beta-D-glucopyranosyl)-4'-O
3-O-乙酰基-2-苄氧基羰基氨基-2-脱氧-4,6-O-亚乙基-α-(7 alpha)和-β-D-吡喃葡萄糖(7 beta)及其3-O-氯乙酰基类似物的合成(描述了11 alpha和11 beta)。7α与4'-O-苄氧基羰基-4'-O-去甲基-4-表鬼臼毒素(8)的缩合(BF3-醚酸酯,-20度乙酸乙酯)(8)主要提供β-糖苷9β(α,β-比例1:9)。11αβ与8或4'-O-氯乙酰基类似物13的缩合反应主要产生4-O-(2-苄氧基羰基氨基-3-O-氯乙酰基-2-脱氧-4,6-O-乙基亚乙基-β- D-吡喃葡萄糖基)-表鬼臼毒素12 beta或15 beta。鬼臼毒素(14)与11个alphaβ的糖基化作用(在此期间,糖苷配基在BF3醚酸酯的作用下在C-4上差向异构化)提供比例为1:5的α-(16 alpha)和β-糖苷(16 beta)。从12β,其α类似物12α和15β中除去氯乙酰