Organofluorverbindungen und Fluorierungsagenzien 12<sup>1</sup>. Von<i>manno</i>-Pyranosiden zu 3,4-<i>O</i>-(2,2,2-Trichlorethyliden)altropyranosylfluoriden in nur zwei Reaktionsschritten
作者:Ralf Miethchen、Daniel Rentsch
DOI:10.1055/s-1994-25583
日期:——
Organofluorine Compounds and Fluorinating Agents 12.1 From manno-Pyranosides to 3,4-O-(2,2,2-Trichloroethylidene) altropyranosyl Fluorides in Only Two Reaction Steps Methyl α-D-mannopyranoside (1) and methyl α-L-rhamnopyrano-side (9) react with chloral and dicyclohexylcarbodiimide (DCC) in an one-pot reaction selectively to form the α-D-altropyranoside 2 and α-L-altropyranoside 10, respectively, in good yield. The glycosyl donor 3 was prepared from 2 by treatment with hydrogen fluoride/nitromethane/acetic anhydride. Compound 2 can be deprotected stepwise by treatment with methanol/sodium methanolate at r.t. to 4, and heating under reflux to methyl 3,4-O-(2,2,2-trichloroethylidene)-α-D-altropyranoside (5). Treatment of the dihydroxy derivative 5 with hydrogen fluoride/nitromethane/acetic anhydride gave an anomeric mixture of the α/β-D-altropyranosyl fluorides 6. Acylation of 5 with benzoyl or pivaloyl chloride gave the corresponding 2,6-diacyl derivatives 7 and 8, respectively. Finally, the α-L-altro-pyranoside 10 was deprotected in boiling methanol/sodium methanolate to afford the α-L-altropyranoside 11 and fluorinated in hydrogenfluoride/nitromethane/acetic anhydride to α-L-altropyranosyl fluoride 12. The various functionalized altropyranoses differ partially in their conformations. The ratio of the endo-H to exo-H diastereomers of the chloral acetals was determined.
有机氟化合物和氟化剂 12.1 从甘露吡喃糖苷到 3,4-O-(2,2、甲基δ-D-吡喃甘露糖苷 (1) 和甲基δ-L-吡喃鼠李糖苷 (9) 与氯醛和二环己基碳二亚胺 (DCC) 发生选择性反应,分别生成δ-D-吡喃金刚烷糖苷 2 和δ-L-吡喃金刚烷糖苷 10,产率良好。用氟化氢/硝基甲烷/乙酸酐处理 2,制备出糖基供体 3。将化合物 2 用甲醇/甲醇钠在恒温条件下处理至 4,然后在回流条件下加热,可逐步脱保护,制得甲基 3,4-O-(2,2,2-三氯亚乙基)-δ±-D-酰基吡喃糖苷 (5)。 用氟化氢/硝基甲烷/乙酸酐处理二羟基衍生物 5,得到δ/δ-D-altropyranosyl 氟化物 6 的同分异构体混合物。用苯甲酰氯或特戊酰氯对 5 进行酰化,分别得到相应的 2,6-二乙酰基衍生物 7 和 8。最后,δ-L-酰基吡喃糖苷 10 在沸腾的甲醇/甲醇钠中脱保护,得到δ-L-酰基吡喃糖苷 11,在氟化氢/硝基甲烷/乙酸酐中氟化,得到δ-L-酰基吡喃糖基氟化物 12。各种官能化的altropyranoses在构象上存在部分差异。测定了氯醛缩醛的内-H 非对映异构体和外-H 非对映异构体的比例。