Versatile use of bis-cyclic thionocarbonates of polyols as bis-electrophilic intermediates. Synthesis of polyhydroxylated thioanhydropentitols with d,l-arabino, l-ribo and l-xylo, and thioanhydroaldoses with d-lyxo, l-ribo, d-xylo, d-allo, d-gulo and d-altro configurations
作者:Alain Danquigny、Mohammed Benazza、Sylvain Protois、Gilles Demailly
DOI:10.1016/j.tetlet.2004.03.197
日期:2004.5
1-O-Benzylpentitols (with D-arabino, D-, D,L-xylo and D,L-ribo configurations) and aldose dibenzyldithioacetals (with L-arabino, D-lyxo, D-xylo, D-ribo, D-galacto, D-gluco and D-manno configurations) were directly and efficiently transformed into their cyclic bis-thionocarbonate derivatives (61-73%) by reaction with diimidazolyl thione (Im(2)CS) in 1,4-dioxane. These bis-electrophilic adducts react regioselectively with Na2S-9H(2)O to lead to 1,4-, 2,5- or 3,6-thioanhydroalditol derivatives in good yields (47-65%). Thioanhydro configurations D,L-arabino, L-ribo and L-xylo from pentitols, and D-lyxo, L-ribo, D-xylo, D-allo, D-gulo and D-altro from aldoses were obtained. (C) 2004 Elsevier Ltd. All rights reserved.