β-Hydroxynorbornane amino acid derivatives: valuable synthons for the diastereoselective preparation of substituted cyclopentylglycine derivatives
作者:Sara Pellegrino、Francesca Clerici、Maria Luisa Gelmi
DOI:10.1016/j.tet.2008.04.038
日期:2008.6
The behaviour towards the retro-aldol or retro-Dieckmann reactions of several norbornene and norbornane amino acids functionalized with an oxygen atom at C-β and characterized by different features, such as the substitution pattern and the constraints, was investigated. By C2–C3 disconnection new differently functionalized cyclopentenyl- and cyclopentylglycines were prepared. This synthetic approach
研究了在C-β处被氧原子官能化并具有不同特征(例如取代模式和限制条件)的几种降冰片烯和降冰片烷氨基酸对逆醛醇或逆Dieckmann反应的行为。通过C 2 -C 3断开,制备了新的不同官能的环戊烯基和环戊基甘氨酸。该合成方法允许根据起始降冰片烷衍生物将立体化学控制在两个到四个立体中心,并为每个衍生物在氨基酸立体中心提供一对差向异构化合物。取决于起始试剂的特征和反应条件,氨基酸碳原子的立体化学的部分控制也是可能的。