An economic synthesis of 1,2,3,4-tetra-O-acetyl-5-thio-d-xylopyranose and its transformation into 4-substituted-phenyl 1,5-dithio-d-xylopyranosides possessing antithrombotic activity11Orally active antithrombotic thioglycosides, Part V. For Part IV see[1].22Presented partly at the 9th European Carbohydrate Symposium, Utrecht, 6–11 July 1997, Abstr. A16.
作者:Éva Bozó、Sándor Boros、János Kuszmann、Eszter Gács-Baitz、László Párkányi
DOI:10.1016/s0008-6215(98)00088-3
日期:1998.4
(26) which, after methanolysis, acetylation and subsequent acetolysis afforded 14 in an overall yield of 56%. Treatment of 4 with sulfuryl chloride gave a mixture containing 5-chloro-3-O-chlorosulfonyl-5-deoxy-1,2-O-isopropylidene-alpha-D- xylofuranose, 3,7,9,11-tetraoxa-4-thia-10-dimethyl-tricyclo[6,3,0, 0(2,6)]undecane S-dioxide and 23 in a 2:3:7 ratio. Tetraacetate 14 was converted into the alpha-1-bromide
D-木糖经1,2-O-异亚丙基-α-D-木呋喃糖(4)转化为3-O-苯甲酰基-5-S-苯甲酰基-1,2-O-异亚丙基-α-D-木呋喃糖,甲醇分解后,乙酰化和随后的乙酰分解得到1,2,3,4-四-O-乙酰基-5-硫代-α-D-吡喃木糖(14),总产率为36%。4与亚硫酰氯的反应得到非对映体环状亚硫酸盐的混合物,其结构通过X射线晶体学确定。用高碘酸钠氧化得到相应的环状硫酸盐23。用硫代乙酸钾处理23,得到5-S-乙酰基1,2-O-异亚丙基-α-D-木呋喃糖3-O-磺酸的钾盐(26 ),在甲醇分解,乙酰化和随后的乙酰分解后,得到14,总产率为56%。用硫酰氯处理4得到含有5-氯-3-O-氯磺酰基-5-脱氧-1,2-O-异亚丙基-α-D-木呋喃糖,3,7,9,11-四氧杂-4-的混合物硫代-10-二甲基-三环[6,3,0,0(2,6)]十一烷S-二氧化物和23的比例为2:3:7。将四乙酸酯14转化