Stereoselective synthesis of 1,1′-linked α-l-lyxopyranosyl β-d-glucopyranoside, the proposed biosynthetic precursor of the FG ring system of avilamycins
作者:Magnus S. Schmidt、Valentin Wittmann
DOI:10.1016/j.carres.2008.05.004
日期:2008.7
The non-reducing disaccharide beta-d-Glcp-(1<-->1)-alpha-L-Lyxp1 had been proposed to be an early intermediate during the biosynthesis of avilamycin A [Boll, R.; Hofmann, C.; Heitmann, B.; Hauser, G.; Glaser, S.; Koslowski, T.; Friedrich, T.; Bechthold, A. J. Biol. Chem.2006, 281, 14756-14763]. This work describes a comparison of two strategies for the synthesis of 1 and its 2-amino-2-deoxy analog
已经提出非还原性二糖β-d-Glcp-(1→1)-α-L-Lyxp1是阿维霉素A生物合成过程中的早期中间体[Boll,R。; J.Biol.Chem。,1992,5,5]。霍夫曼角;Heitmann,B .;Hauser,G .;Glaser,S .; T. Koslowski;弗里德里希(T.)Bechthold,AJ Biol。化学,2006,281,14756-14763]。这项工作描述了两种合成1及其2-氨基-2-脱氧类似物的策略,其中葡萄糖或溶糖部分作为糖基供体。用2,3,4-三-O-乙酰基-α-L-lypypyyranosyl三氯乙酰亚胺酸酯13可获得最佳的立体选择性和收率。13与2,3,4,6-四-O-乙酰基-的反应D-吡喃葡萄糖以1∶1,1′α和1β,1′β异构体的混合物形式以10∶1的比例产生二糖,产率为50%。13和3,4的反应 6-三-O-乙酰基-2-叠氮基-2-脱氧