Preparative synthesis of C-(α-d-glucopyranosyl)-alkenes and -alkadienes: Diels-alder reaction
作者:Maria de Gracia Garcia Martin、Derek Horton
DOI:10.1016/0008-6215(89)85066-9
日期:1989.8
The reaction of 2,3,4,6-tetra-O-benzyl-1-O-(p-nitrobenzoyl)-alpha-D-glucopyranose with (E)-penta-2,4-dienyltrimethylsilane and boron trifluoride etherate in acetonitrile afforded stereoselectively (E)-5-(tetra-O-benzyl-alpha-D-glucopyranosyl)-1,3-pentadiene in good yield. The readily available penta-O-benzoyl-alpha-D-glucopyranose reacted with allyltrimethylsilane in the presence of boron trifluoride
2,3,4,6-四-O-苄基-1-O-(对硝基苯甲酰基)-α-D-吡喃葡萄糖与(E)-戊-2,4-二烯基三甲基硅烷和三氟化硼醚化物在乙腈中的反应以良好的收率得到立体选择性地(E)-5-(四-O-苄基-α-D-吡喃葡萄糖基)-1,3-戊二烯。在乙腈中,在三氟化硼醚化物的存在下,易于获得的五-O-苯甲酰基-α-D-吡喃葡萄糖与烯丙基三甲基硅烷反应,生成3-(四-O-苯甲酰基-α-D-吡喃葡萄糖基)-1-丙烯及其β异构体的产率分别为60%和2.3%。将马来酸酐的Diels-Alder环加成成二烯1可以高收率得到加成物顺式,顺式3-(四-O-苄基-α-D-吡喃葡萄糖基甲基)环己基-4-烯-1,2-二羧酸酐。