The total synthesis of biphenomycin A is described. Two of the five stereogenic centres were formed by enantioselective hydrogenation of the corresponding didehydroamino acids using the rhodium-DIPAMP catalyst and the two stereogenic centres of the α-amino-β-hydroxy unit were created by enantioselective hydrogenation using the ruthenium-BINAP catalyst or via a stereoselective aldol condensation, respectively. The biphenyl structural element was constructed by a palladium(0)-catalyzed coupling reaction. The 15-membered ansa ring was closed in 85 % yield by use of the appropriate, linear pentafluorophenyl ester in the two phase system chloroform/aqueous sodium hydrogen carbonate.
本文描述了
联苯霉素 A 的全合成过程。五个立体中心中的两个是通过使用
铑-
DIPAMP 催化剂对相应的双脱氢
氨基酸进行对映选择性氢化形成的,δ-
氨基-δ-羟基单元的两个立体中心分别是通过使用
钌-BINAP 催化剂进行对映选择性氢化或通过立体选择性醛醇缩合形成的。
联苯结构单元是通过
钯(0)催化的偶联反应生成的。在
氯仿/
水性
碳酸氢钠两相体系中,使用适当的线性
五氟苯基酯封闭 15 元的安萨环,收率为 85%。