Multiple Functionalization of Bis(2-pyridylimino)isoindole (BPI) Ligands: Their Modular Synthesis and Coordination to Palladium(II)
作者:Bettina A. Siggelkow、Lutz H. Gade
DOI:10.1002/zaac.200500067
日期:2005.10
Polyether dendritic wedges have been attached to bis(2-pyridylimino)isoindole (BPI) ligands, and the corresponding PdII complexes have been synthesized and studied as hydrogenation catalysts. The fixation of dendrons at the ligand framework was carried out at the stage of the phthalodinitrile precursor of the BPI ligands by nucleophilic substitution of 4-nitrophthalodinitrile with the in situ generated
聚醚树枝状楔形物已连接到双 (2-吡啶亚氨基) 异吲哚 (BPI) 配体上,相应的 PdII 配合物已被合成并作为氢化催化剂进行研究。在 BPI 配体的邻苯二甲腈前体阶段,通过 4-硝基邻苯二甲腈与原位生成的醇化物的亲核取代,将树枝状分子固定在配体框架上。1,3-二苄氧基-2-丙醇 [G-1] 与 Frechet 第一代和第二代芳醚树枝状化合物 [(3,5) -G-1] -OH、[t-Bu- (3,5 ) -G-1] -OH 和 [(3,5) -G-2] -OH 与 4-硝基邻苯二甲腈生成相应的 O-偶联邻苯二甲腈衍生物。BPI 配体的合成是通过与两摩尔当量的 2-氨基-5-溴吡啶反应得到原配体 (11-Br) -BPI- [G-1] (4) 和 (11-Br) -BPI 来实现的- [R- (3,5) -G-1] (R = H: 5a, tBu: 5b) 而化合物 5a 与 Me3SiCCH、Ph3SiCCH