title: Chemoselective alkynylation of N-sulfonylamides versus amides and carbamates--synthesis of tetrahydropyrazines.
abstract: The chemoselective alkynylation of N-sulfonylamides versus amides and carbamates using TMS-EBX as an alkynylating agent leads to the formation of non-symmetrical tetrahydropyrazines from orthogonally protected diamines.
authors.affiliation: Laboratoire de Chimie Organique associé au CNRS, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Aubineau
authors.forename: Janine
authors.initials: J
authors.lastname: Cossy