TetraPh-Tol-BITIOPO: a new atropisomeric 3,3′-bithiophene based phosphine oxide as an organocatalyst in Lewis base-catalyzed Lewis acid mediated reactions
作者:Abbinante Vincenzo Mirco、Benaglia Maurizio、Rossi Sergio、Benincori Tiziana、Cirilli Roberto、Pierini Marco
DOI:10.1039/c9ob01297d
日期:——
catalyst was able to promote the allylation of aldehydes with allyltrichlorosilane in up to 98% yield and up to 96% enantiomeric excess (ee), and the direct aldol reaction to afford β-hydroxy ketones and β-hydroxy thioesters, with good chemical yields and modest stereochemical efficiency. Computational studies helped to elucidate and to rationalize the stereochemical outcome of the reactions catalyzed
合成了一种新的基于3,3'-联噻吩骨架的手性氧化膦(TetraPh-Tol-BITIOPO),对其进行了充分表征,并通过手性HPLC分离为对映体。该新化合物已成功用作路易斯碱催化的路易斯酸介导的涉及三氯甲硅烷基化合物的反应中的有机催化剂。新的阻转异构催化剂能够以高达98%的收率和高达96%的对映体过量(ee)促进醛与烯丙基三氯硅烷的烯丙基化反应,并通过直接的羟醛反应生成β-羟基酮和β-羟基硫代酯,具有良好的催化活性。化学收率和适度的立体化学效率。