Intramolecular Tsuji–Trost-type Allylation of Carboxylic Acids: Asymmetric Synthesis of Highly π-Allyl Donative Lactones
作者:Yusuke Suzuki、Tomoaki Seki、Shinji Tanaka、Masato Kitamura
DOI:10.1021/jacs.5b05786
日期:2015.8.5
and low E factor. This success can be ascribed to the higher reactivity of allylic alcohols as compared with the allyl ester products in soft Ru/hard Brønstead acid combined catalysis, which can function under slightly acidic conditions unlike the traditional Pd-catalyzed system. Detailed analysis of the stereochemical outcome of the reaction using an enantiomerically enriched D-labeled substrate
已经通过使用带有轴向手性吡啶甲酸型配体(Cl-Naph-PyCOOH:naph = 萘基,py = 吡啶)的阳离子 CpRu 络合物实现了 Tsuji-Trost 型羧酸的不对称烯丙基化。羧酸和烯丙醇通过释放水分子内缩合,而无需亲核试剂或亲电试剂部分的化学计量活化,从而实现高原子和步进经济性以及低 E 因子。这一成功可归因于烯丙醇与软 Ru/硬 Brønstead 酸联合催化中的烯丙酯产品相比具有更高的反应性,与传统的 Pd 催化体系不同,它可以在微酸性条件下发挥作用。