Reaction of Hex-1-enopyranose-3-uroses with Organometallic Reagents. Regio- and Stereoselective Introduction of Allylic Substituents on Pyranose Ring
作者:Masashi Takiya、Mari Ishii、Koichi Shibata、Yuji Mikami、Oyo Mitsunobu
DOI:10.1246/cl.1991.1917
日期:1991.11
4,6-O-Benzylidene-1,2-dideoxy-D-threo-hex-1-enopyranose-3-urose reacted with allylic organometallic reagents, CH2=CR–CH2–Metal [R = H or CH3; Metal = MgCl, AlEt2, or Ti(OPri)3], to selectively give 4,6-O-benzylidene-1,2-dideoxy-3-C-(2-propenyl- or 2-methyl-2-propenyl)-D-lyxo-hex-1-enopyranose. On the other hand, the erythro isomer gave 3-C-(2-propenyl- or 2-methyl-2-propenyl)-D-arabino-hex-1-enopyranose
4,6-O-Benzylidene-1,2-dideoxy-D-threo-hex-1-enopyranose-3-urose 与烯丙基有机金属试剂反应,CH2=CR–CH2–Metal [R = H 或 CH3; 金属 = MgCl、AlEt2 或 Ti(OPri)3],选择性地得到 4,6-O-benzylidene-1,2-dideoxy-3-C-(2-propenyl- or 2-methyl-2-propenyl)- D-lyxo-hex-1-enopyranose。另一方面,赤型异构体得到 3-C-(2-丙烯基-或 2-甲基-2-丙烯基)-D-阿拉伯-己-1-烯吡喃糖和相应的核糖异构体,比例为 1:1到 10 : 1