Nickel-Catalyzed Multicomponent Coupling: Synthesis of α-Chiral Ketones by Reductive Hydrocarbonylation of Alkenes
作者:Jian Chen、Shaolin Zhu
DOI:10.1021/jacs.1c07851
日期:2021.9.8
functionalized α-stereocenter, including enantioenriched chiral α-aryl ketones and α-amino ketones. It useschiral bisoxazoline as a ligand, silane as a reductant, chloroformate as a safe CO source, and a racemic secondary benzyl chloride or an N-hydroxyphthalimide (NHP) ester of a protected α-amino acid as the alkylation reagent. The benign nature of this process renders this method suitable for late-stage functionalization
已经开发出一种镍催化、多组分区域选择性和对映选择性偶联,通过顺序加氢甲酰化和羰基化从容易获得的起始材料中进行。这种模块化的多组分加氢官能化策略能够对各种未活化的烯烃进行直接的还原烃基化,以产生各种带有功能化 α-立体中心的不对称二烷基酮,包括对映体富集的手性 α-芳基酮和 α-氨基酮。它使用手性双恶唑啉作为配体,硅烷作为还原剂,氯甲酸酯作为安全的 CO 源,外消旋仲苄基氯或N受保护的 α-氨基酸的 -羟基邻苯二甲酰亚胺 (NHP) 酯作为烷基化试剂。该过程的良性性质使该方法适用于复杂分子的后期功能化。
A Mild, Palladium-Catalyzed Method for the Dehydrohalogenation of Alkyl Bromides: Synthetic and Mechanistic Studies
作者:Alex C. Bissember、Anna Levina、Gregory C. Fu
DOI:10.1021/ja306323x
日期:2012.8.29
accomplish palladium-catalyzed dehydrohalogenations of alkyl bromides to form terminal olefins. We have applied this method, which proceeds in excellent yield at room temperature in the presence of a variety of functional groups, to a formal total synthesis of (R)-mevalonolactone. Our mechanistic studies have established that the rate-determining step can vary with the structure of the alkyl bromide and