Stereoinvertive C–C Bond Formation at the Boron‐Bound Stereogenic Centers through Copper‐Bipyridine‐Catalyzed Intramolecular Coupling of α‐Aminobenzylboronic Esters
作者:Yukako Yoshinaga、Takeshi Yamamoto、Michinori Suginome
DOI:10.1002/anie.201914864
日期:2020.4.27
Enantiospecific intramolecular Suzuki-Miyaura-type coupling with α-(2-halobenzoylamino)benzylboronic esters to give 3-substituted isoindolinones is achieved by using copper catalysts with 2,2'-bipyridine-based achiral ligands. Enantioenriched α-aminobenzylboron reactants bearing a hydrogen atom at the boron-bound stereogenic carbons undergo stereoinvertive coupling in the presence of a 6-phenyl-2,2'-bipyridine
通过使用具有2,2'-联吡啶的非手性配体的铜催化剂,可以实现与α-(2-卤代苯甲酰基氨基)苄基硼酸酯的对映体分子内Suzuki-Miyaura型偶联,生成3-取代的异吲哚啉酮。在具有高对映体特异性的6-苯基-2,2'-联吡啶配体的存在下,在硼结合的立体碳上带有氢原子的对映体富集的α-氨基苄基硼反应物进行立体反转偶联。在存在简单的2,2'-联吡啶作为配体的情况下,带有完全取代的与硼结合的立体成核中心的α-氨基苄基硼酸酯也给出了3,3-二取代的异吲哚啉酮,具有立体定向的立体化学转化作用。