Alkylation of silyl enolates with tert-alkyl or allylic fluorides proceeds smoothly in the presence of a catalytic amount of borontrifluoride to afford the corresponding carbonyl compounds. Allylation and reduction of alkylfluorides with allylsilane and hydrosilane, respectively, occur under BF3 catalysis.
Direct α-allylation of a variety of ketones and aldehydes with 2-allylisourea took place in the presence of a catalytic amount of a palladium(0) complex under neutral and mild conditions. Scope and limitations of this novel method have been investigated.
Palladium(0)-Catalyzed Reactions of Allylic Benzotriazoles with Enamines: A Novel Method for the Stereoselective Synthesis of (4<i>E</i>)-γ,δ-Unsaturated Ketones
Stereodivergent Nucleophilic Additions to Racemic β-Oxo Acid Derivatives: Fast Addition Outcompetes Stereoconvergence in the Archetypal Configurationally Unstable Electrophile
作者:Pedro De Jesús Cruz、Evan T. Crawford、Shubin Liu、Jeffrey S. Johnson
DOI:10.1021/jacs.1c07702
日期:2021.10.6
Additions of carbon nucleophiles to racemic α-stereogenic β-oxo acidderivatives that deliver enantiomerically enriched tertiary alcohols are valuable, but uncommon. This article describes stereodivergent Cu-catalyzed borylative cyclizations of racemic β-oxo acidderivatives bearing tethered pro-nucleophilic olefins to deliver highly functionalized cyclopentanols containing four contiguous stereogenic
将碳亲核试剂添加到外消旋 α-立体 β-氧代酸衍生物中,以提供对映异构体富集的叔醇是有价值的,但并不常见。本文描述了带有束缚前亲核烯烃的外消旋 β-氧代酸衍生物的立体发散 Cu 催化的硼化环化,以提供含有四个连续立体中心的高度官能化的环戊醇。报告的协议适用于一系列β-含氧酸衍生物,并且非对映体产物很容易通过典型的色谱技术分离。α-立体-β-酮酯通常被认为具有极端或自发的构型脆性,