Rearrangement reactions in the fluorination of 3-deoxy-3-C-methyl-3-nitro-hexopyranosides (and hexo-1-thiopyranosides) of the D- and L-series by the DAST reagent

被引:23
作者
Borrachero, P [1 ]
Cabrera-Escribano, F [1 ]
Carmona, AT [1 ]
Gómez-Guillén, M [1 ]
机构
[1] Univ Seville, Fac Quim, Dept Quim Organ Profesor Garcia Gonzalez, E-41071 Seville, Spain
关键词
D O I
10.1016/S0957-4166(00)00252-4
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Fluorination of diverse 3-deoxy-3-C-methyl-3-nitro-hexopyranosides and hexo-1-thiopyranosides of the D- and L-series by the DAST reagent was studied in order to establish, on this 3-branched-chain sugar domain, the influence of the stereochemical relationship of the substituents at positions 1 and 2, as well as the protection of the HO-4, on the kinds of rearrangement reaction promoted by this fluorinating agent. Three classes of pyranosidic substrate were employed. (a) 1,2-trans configured, irrespective of whether HO-4 is protected or not: (b) 4-O-protected 1,2-cis configured; and (c) 4-O-unprotected 1,2-cis configured. They were prepared starting from simple glycosides through routes involving a Baer reaction and subsequent transformations by known methodology. All the substrates of class a essayed underwent, on treatment with DAST at room or higher temperatures, a rearrangement involving a 1,2-shift to give both the anomeric 2-inverted pyranosyl fluorides (or, for the l-thioglycosides, only the a fluoride). Substrates of class b led, through a mechanism similar to that proposed for transformations of related substrates, to ring-contracted 2,5-anhydro-1-fluoro-1-O-methyl- (or 1-deoxy-1-phenylthio-)hexitol derivatives (sometimes as 1-epimers), which are precursors of 2,5-anhydro-aldehydo-sugars. Substrates of class c led to 4,5-anhydro-1-fluoro-1-O-methylalditol derivatives in all cases, together with a ring-contracted 5-fluoro-hexofuranoside ill only one case; a rationalisation for their formation is proposed. (C) 2000 Elsevier Science Ltd. All rights reserved.
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页码:2927 / 2946
页数:20
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