The allylboron reagent 4 prepared from endo-2-phenyl-exo-2,3-bornanediol reacts with achiral aldehydes to give homoallylic alcohols in good yields and high enantioselectivity (70–85% ee). This new reagent also exhibits good levels of matched and mismatched diastereoselection in reaction with chiral aldehydes. A mechanism is proposed to explained the high regio and stereoselectivity of this carboalkoxyallylboration
由内-2-苯基-exo-2,3-降
冰片二醇制备的烯丙基硼试剂4与非手性醛反应生成均一醇,收率高,对映选择性高(70-85%ee)。在与手性醛反应中,这种新试剂还表现出良好的匹配和错配非对映选择性。提出了一种机制来解释该碳烷氧基烯丙基化反应的高区域选择性和立体选择性。