The Diels-Alder reactions of some carbohydrate derivatives, as chiral acrylic esters, with cyclopentadiene proceed highly diastereoselectively to provide the adducts carrying a norbornene carboxylate. By reductive removal of the carbohydrate templates from the adducts, both 2S and 2R-enriched 5-norbornene-2-methanol are obtained.
某些
碳水化合物衍
生物(手性
丙烯酸酯)与
环戊二烯的 Diels-Alder 反应具有高度非对映选择性,可生成含有
降冰片烯羧酸盐的加合物。通过还原去除加合物中的
碳水化合物模板,可得到富含 2S 和 2R 的
5-降冰片烯-2-甲醇。