Concise and Stereodivergent Approach to Chromanone Lactones through Copper‐Catalyzed Asymmetric Vinylogous Addition of Siloxyfurans to 2‐Ester‐Substituted Chromones
A copper(I)-catalyzed asymmetricvinylogousaddition of siloxyfurans to 2-ester-substituted chromones is described. This method generated enantioenriched chromanonelactones with divergent diastereoselectivities depending on the ligand used and enabled a concise and enantioselective synthesis of (−)-blennolide B with excellent stereoselectivity.
描述了铜 (I) 催化的硅氧基呋喃不对称乙烯基加成到 2-酯取代色酮中。该方法根据所使用的配体产生了具有不同非对映选择性的对映富集色满酮内酯,并能够以优异的立体选择性实现 (-)-blennolide B 的简明和对映选择性合成。
Enantioselective Dearomative Alkynylation of Chromanones: Opportunities and Obstacles
作者:Anita E. Mattson、Yong Guan、Tadas Buivydas、Remy F. Lalisse、Rameez Ali、Christopher M. Hadad
DOI:10.1055/a-1811-8075
日期:2022.10
A catalytic and highly enantioselective dearomative alkynylation of chromanones has been discovered that enables the construction of biologically relevant tertiary ether stereogenic centers. This methodology is robust, accommodating a variety of alkynes and chromanones. More than 40 substrates tested gave rise to >90% ee. Computational studies have indicated that the optimal indanyl ligand identified