Commercially available neat organozincs as highly reactive reagents for catalytic enantioselective addition to ketones and aldehydes under solvent free conditions
作者:Manabu Hatano、Tomokazu Mizuno、Kazuaki Ishihara
DOI:10.1016/j.tet.2011.02.042
日期:2011.6
Ph2Zn, and highly concentrated Me2Zn are highly reactive organozinc reagents, which are commercially available in bulk quantities. We here report a catalytic enantioselective Et2Zn, Ph2Zn, and Me2Zn addition to ketones and aldehydes under solventfree or highly concentrated conditions without Ti(Oi-Pr)4 as a conventional activator of organozinc reagents. The desired optically active tertiary and secondary
Overcoming the Naphthyl Requirement in Stereospecific Cross-Couplings to Form Quaternary Stereocenters
作者:Jianyu Xu、Olivia P. Bercher、Mary P. Watson
DOI:10.1021/jacs.1c03898
日期:2021.6.16
a simple stilbene ligand has enabled a stereospecific Suzuki–Miyaura cross-coupling of tertiary benzylic carboxylates, including those lacking naphthyl substituents. This method installs challenging all-carbon diaryl quaternary stereocenters in good yield and ee and represents an important breakthrough in the “naphthyl requirement” that pervades stereospecific cross-couplings involving enantioenriched
使用简单的二苯乙烯配体能够实现立体定向 Suzuki-Miyaura 叔苄基羧酸酯的交叉偶联,包括那些缺乏萘基取代基的羧酸酯。该方法以良好的产率和 ee 安装具有挑战性的全碳二芳基四元立体中心,代表了在涉及对映体富集亲电试剂的立体特异性交叉偶联中普遍存在的“萘基要求”的重要突破。