Enantioselective synthesis of planar-chiral 1,n-dioxa[n]paracyclophanes via catalytic asymmetric ortho-lithiation

Org Lett. 2010 May 7;12(9):1980-3. doi: 10.1021/ol100444u.

Abstract

Highly enantioselective ortho-lithiation and dilithiation of 1,n-dioxa[n]paracyclophanes were realized with the use of sec-butyllithium and a catalytic or stoichiometric amount of sparteine. Quenching with various electrophiles, such as iodine, iodomethane, and chlorodiphenylphosphine, afforded chiral mono- and disubstituted paracyclophanes with good to excellent ee.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Ethers, Cyclic / chemistry*
  • Stereoisomerism

Substances

  • Ethers, Cyclic