Stereoselective Synthesis of Secondary Alkyllithiums and Their Application to Stereoselective Cuprations or Intramolecular Carbolithiations for the Stereoselective Synthesis of Alkylidene-cyclobutanes

Moriya, Kohei; Schwärzer, Kuno; Karaghiosoff, Konstantin und Knochel, Paul (2016): Stereoselective Synthesis of Secondary Alkyllithiums and Their Application to Stereoselective Cuprations or Intramolecular Carbolithiations for the Stereoselective Synthesis of Alkylidene-cyclobutanes. In: Synthesis-Stuttgart, Vol. 48, No. 19: pp. 3141-3154

Abstract

Secondary alkyllithium reagents were prepared stereoselectively via an iodo-lithium exchange by using tert-butyllithium. The resulting secondary alkyllithiums were converted directly into the corresponding alkylcopper reagents by transmetalation with copper(I) bromide-triethyl phosphite [CuBr center dot P(OEt)(3)] with retention of configuration and without significant loss of stereoselectivity. The resulting alkylcopper reagents were used for carbocupration or acylation reactions. In addition, a new intramolecular carbolithiation of secondary alkyllithium reagents possessing a remote alkyne moiety was also investigated, allowing the stereoselective production of alkylidenecylobutane derivatives with very high stereocontrol.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0039-7881
• Language: English