Construction of the biaryl moiety of stegane and related compounds through an intramolecular biaryl coupling reaction is described. Undesired products were obtained by the intramolecular coupling reaction of benzyl benzoates (8, 13, and 14) because of their steric and electrostatic properties, and only that of phenyl benzoates (26b and 26c) afforded the desired biaryl lactones in good yields. An asymmetric
描述了通过分子内联芳基偶合反应构建硬脂烷和相关化合物的联芳基部分。不希望的产物通过
苄基苯甲酸酯(的分子内偶合反
应得到8,13,和14,因为它们的空间和静电性质),并且只有
苯基
苯甲酸酯(的26B和26C,得到所需的二芳基内
酯以良好产率)。使用对映选择性内
酯开放反应,然后四步转化为已知化合物,已经实现了标题化合物的不对称形式合成。