boron-masking strategy, new divalent cross-coupling modules have been designed for the efficient synthesis of boron-substituted oligoarenes. The modules, i.e., monoprotected o-, m-, and p-benzenediboronic acid derivatives, undergo highly selective Suzuki-Miyaura coupling with sp2 iodides, bromides, chlorides, and triflates, affording coupling products in which the protected boronyl groups are left intact
Synthesis of optically active polymers with chiral units attached to rigid backbones and their application for asymmetric catalysis
作者:Qiao-Sheng Hu、Chaode Sun、Colleen E Monaghan
DOI:10.1016/s0040-4039(01)01689-6
日期:2001.10
Opticallyactive ephedrine-bearing poly(phenylene)s have been synthesized by using the Suzuki coupling polymerization. Their application as polymeric chiral catalysts for asymmetric addition of diethylzinc to aldehydes has been studied and good enantioselectivity was observed. The strategy to synthesize these opticallyactive polymers is potentially useful in the design and synthesis of other polymeric