Acylsilanes in Rhodium (III)‐Catalyzed Directed Aromatic C–H Alkenylations and Siloxycarbene Reactions with C C Double Bonds

P Becker, DL Priebbenow… - Angewandte Chemie …, 2014 - Wiley Online Library
P Becker, DL Priebbenow, R Pirwerdjan, C Bolm
Angewandte Chemie International Edition, 2014Wiley Online Library
Acylsilanes are known to undergo a 1, 2‐silicon‐to‐oxygen migration under thermal or
photochemical conditions to form siloxycarbenes. However, there are few reports regarding
the application of siloxycarbenes in organic synthesis and surprisingly, their reaction with
C C double or triple bonds remains virtually unexplored. To facilitate such a study,
previously inaccessible aromatic acylsilanes containing an ortho‐tethered C C double
bond were identified as suitable substrates. To access these key intermediates, we …
Abstract
Acylsilanes are known to undergo a 1,2‐silicon‐to‐oxygen migration under thermal or photochemical conditions to form siloxycarbenes. However, there are few reports regarding the application of siloxycarbenes in organic synthesis and surprisingly, their reaction with CC double or triple bonds remains virtually unexplored. To facilitate such a study, previously inaccessible aromatic acylsilanes containing an ortho‐tethered CC double bond were identified as suitable substrates. To access these key intermediates, we developed a new synthetic method utilizing a rhodium‐catalyzed oxidative Heck‐type olefination involving the application of an acylsilane moiety as a directing group. When exposed to visible‐light irradiation, the ortho‐olefinated acylsilanes underwent a smooth intramolecular cyclization process to afford valuable indanone derivatives in quantitative yields. This result paves the way for the development of new transformations involving siloxycarbene intermediates.
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