Precise structure activity relationships in asymmetric catalysis using carbohydrate scaffolds to allow ready fine tuning: dialkylzinc–aldehyde additions
作者:Daniel P. G. Emmerson、Renaud Villard、Claudia Mugnaini、Andrei Batsanov、Judith A. K. Howard、William P. Hems、Robert P. Tooze、Benjamin G. Davis
DOI:10.1039/b309715n
日期:——
carbohydrate ligand structures from a core D-glucosamine scaffold has allowed the evaluation of broad ranging structure activity relationships in ligand accelerated zincate additions to aldehydes, with variations in deltadeltaG+/+(R-S) of up to 5650 J mol(-1) that create opposing senses of asymmetric induction and that are consistent with models based on several ligand X-ray structures and molecular mechanics
从核心D-氨基葡萄糖支架上迅速构建24种立体化学和功能多样的碳水化合物配体结构,可以评估配体促进锌酸酯加成醛中广泛的结构活性关系,δG+ / +(RS)的变化最高可达5650 J mol(-1)会产生不对称感应的相反感觉,并且与基于几种配体X射线结构和分子力学分析的模型一致。使用关键的二面角和N-2的空间体积进行对映选择性的因子分析,也突出了在配体构建中使用因子设计的潜力。