Synergistic Palladium/Lewis Acid‐Catalyzed Regio‐ and Stereo‐divergent Bissilylation of Alkynoates: Scope, Mechanism, and Origin of Selectivity

Author:

Zhao Shuang1,Ding Linlin2,Sun Yingman1,Wang Minyan2,Zhao Dongbing1ORCID

Affiliation:

1. State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry Nankai University 94 Weijin Road Tianjin 300071 China

2. State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China

Abstract

AbstractTransition metal‐catalyzed bissilylation reactions of alkynes with disilane reagents have become one of the most straightforward and efficient protocols to rapidly produce structurally diverse alkenyl silicon derivatives. In these reactions, the utilization of unsymmetrical disilane reagents provided the possibilities for reactivity enhancement as well as the synthetic merits in contrast to symmetrical disilane reagents. However, a major yet challenging objective is achieving precise control over the selectivity including the regioselectivity and the cis/trans‐selectivity. Herein we realized the first divergent bissilylation of alkynoates with our developed air‐stable disilane reagent 8‐(2‐substituted‐1,1,2,2‐tetramethyldisilanyl)quinoline (TMDQ) by means of synergistic Pd/Lewis acid catalytic system. The catalytic system precisely dictates the selectivity, resulting in the divergent synthesis of 1,2‐bissilyl alkenes. The power of these 1,2‐bissilyl alkenes serving as the key synthetic intermediates has been clearly demonstrated by rapid construction of diverse motifs and densely functionalized biologically active compounds. In addition, the origins of the switchable selectivities were well elucidated by experimental and computational studies on the reaction mechanism and were mainly attributed to different ligand steric effects, the use of the specific disilane reagent TMDQ and the different coordination modes of different Lewis acid with alkynoates.

Publisher

Wiley

Subject

General Medicine

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