A series of 3- and 28-glucosides and glucosyl esters of betulinic acid (1a), 28-hydroxy-3,4-secolupa-4(23),20(29)-dien-3-oic acid (22a), dimethyl ester of 28-hydroxy-2,3-secolup-20(29)-en-2,3-dioic acid (43a), their 20(29)-dihydro derivatives (1b, 22b, 43b) and several other triterpenes of the lupane (12a, 12b) and 3,4-secolupane series (18a, 18b, 32a) has been prepared by reaction of tetra-O-acetyl-α-D-glucopyranosyl bromide in acetonitrile in the presence of mercury(II) cyanide and subsequent deacetylation of the obtained tetra-O-acetyl-β-D-glucopyranosyl derivatives. In several cases attempted glucosylation in the presence of silver silicate afforded predominantly the corresponding 1,2-orthoacetates of α-D-glucopyranose.
一系列3-和28-
葡萄糖苷和
葡萄糖酯的萜烯酸(1a),28-羟基-3,4-
环戊二烯-3-酸(22a),28-羟基-2,3-
环戊烷-20-二烯-2,3-二酸二甲酯(43a),它们的20(29)-二氢衍
生物(1b,22b,43b)和几种其他狼毒萜烯(12a,12b)和3,4-
环戊烷系列(18a,18b,32a)已经通过在
乙腈中存在
汞(II)
氰化物的情况下反应四个-O-乙酰-α-
D-葡萄糖吡喃
溴化物,并随后脱乙酰化所得的四个-O-乙酰-β-
D-葡萄糖吡喃衍
生物制备。在几种情况下,尝试在
银硅酸盐存在下进行
葡萄糖化主要得到相应的α-
D-葡萄糖吡喃的1,2-正交
醋酸酯。