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Stability, reactivity, solution, and solid-state structure of halomethylzinc alkoxides.

A B Charette1, C Molinaro, C Brochu

  • 1Département de Chimie, Université de Montréal, P.O. 6128, Station Downtown, Montréal, Québec, Canada H3C 3J7.

Journal of the American Chemical Society
|December 6, 2001
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We developed a Lewis acid-catalyzed cyclopropanation of allylic alcohols using bis(iodomethyl)zinc. This method efficiently synthesizes cyclopropanes, overcoming limitations of uncatalyzed reactions and paving the way for enantioselective synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Organometallic Chemistry

Background:

  • Cyclopropanation reactions are crucial for synthesizing strained ring systems.
  • Halomethylzinc reagents offer a route to cyclopropanes but often require specific activation.
  • Understanding the reactivity and stability of these intermediates is key for reaction development.

Purpose of the Study:

  • To develop a Lewis acid-catalyzed cyclopropanation of allylic alcohols using bis(iodomethyl)zinc.
  • To investigate the preparation, stability, and aggregation of halomethylzinc alkoxides.
  • To elucidate the mechanism of Lewis acid activation in this cyclopropanation.

Main Methods:

  • Treatment of alcohols with bis(iodomethyl)zinc to form iodomethylzinc alkoxides.
  • Catalysis using Lewis acids to promote cyclopropanation.
  • Spectroscopic and crystallographic analyses to study intermediate structures and aggregation.
  • Competition experiments to compare inter- and intramolecular cyclopropanation.

Main Results:

  • Lewis acid catalysis significantly enhances the cyclopropanation of allylic alcohols with bis(iodomethyl)zinc.
  • The Lewis acid-catalyzed pathway is shown to be highly efficient compared to the uncatalyzed reaction.
  • Fundamental insights into the preparation, stability, aggregation, and reactivity of halomethylzinc alkoxides were gained.
  • The study provides a basis for developing enantioselective versions of this cyclopropanation.

Conclusions:

  • Lewis acid catalysis is a powerful tool for activating halomethylzinc alkoxides in cyclopropanation reactions.
  • The developed method offers a new pathway for the synthesis of cyclopropanated allylic alcohols.
  • Further research can build upon these findings to achieve enantioselective control.