4.7 Article

Selectivity Control in Alkylidene Carbene-Mediated C-H Insertion and Allene Formation

Journal

JOURNAL OF ORGANIC CHEMISTRY
Volume 76, Issue 4, Pages 1086-1099

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jo102180f

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Funding

  1. NSF [CHE 0955972]
  2. Direct For Mathematical & Physical Scien
  3. Division Of Chemistry [0955972] Funding Source: National Science Foundation

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Regioselectivity of alkylidene carbene-mediated C-H insertion was explored utilizing electronic, conformational, steric, and stereoelectronic effects. Relying on these factors, highly regio- and chemoselective carbene insertion reaction of C-H bonds in different environments could be obtained. The observed selectivity clearly indicates that an electronic effect plays a more important role than steric effect. In general, C-H bonds in conformationally rigid cyclic environments are less reactive than those in acyclic systems toward carbene insertion, and in this situation, a competing intermolecular reaction between alkylidene carbene and trimethylsilyldiazomethane led to the formation of allenylsilanes. The formation of allenylsilane becomes more favorable as the concentration of reaction becomes higher, as well as the C-H bonds undergoing insertion becomes electronically and conformationally deactivated.

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