Syntheses of deoxyhexoses from diastereoisomerically pure hetero-Diels-Alder adduct
作者:Tomasz Bauer
DOI:10.1016/s0040-4020(97)00159-2
日期:1997.3
Syntheses of deoxyhexoses are presented. The concept is based on the functionalization of enantiomerically pure 6-hydroxymethyl-2-methoxy-5,6-dihydro-2H-pyran, which is easily synthesized by asymmetric hetero-Diels-Alder reaction. Methyl 4,6-dideoxy-alpha-D-arabino-hexopyranoside, methyl alpha-D-chalcoside and methyl alpha-D-desosanimide are synthesized. (C) 1997 Elsevier Science Ltd.
A simple synthesis of dl-chalcose
作者:Samuel Danishefsky、James F. Kerwin
DOI:10.1021/jo00347a053
日期:1982.4
Allylic organometallic way to control acyclic stereochemistry and its application to the synthesis of carbohydrates
The Cram/anti-Cram selectivity in the reactions of allylmetals with aldehydes and the erythro/threo selectivity in the reactions of substituted allylicorganometalliccompounds with other aldehydes can be controlled by the metal (M). Based on both selectivities, we can predict the diastereofacial selectivity of more complex systems. Finally, 1-O-methyl-2,6-dideoxyhexose and 1-O,3-O-dimethyl-4,6-dideoxyhexose
Regiochemical control of the ring opening of 1,2-epoxides by means of chelating processes. Part 17: Synthesis and opening reactions of cis- and trans-oxides derived from (2S,6R)-2-benzyloxy-6-methyl-3,6-dihydro-2H-pyran, (2R,6R)- and (2S,6R)-2-methoxy-6-methyl-5,6-dihydro-2H-pyran
作者:Paolo Crotti、Valeria Di Bussolo、Lucilla Favero、Franco Macchia、Mauro Pineschi
DOI:10.1016/s0040-4020(02)00578-1
日期:2002.7
The regiochemical behavior of the title deoxy anhydrosugars, prepared in an enantioselective way starting from methyl α-d-glucopyranoside, was examined in opening reactions, both under standard and chelating conditions. The results clearly indicate the influence of the reaction conditions and the importance of the relative orientation of the methyl group with respect to the oxirane ring on the regiochemical