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2005
Multicomponent reactions
O 0359
Ammonium Chloride Promoted Ugi Four-Component, Five-Center Reaction of
α-Isocyano Acetic Acid: A Strong Solvent Effect. — Potassium iso12- 067 α-Substituted
cyano acetic acid derivatives are shown to participate efficiently in an Ugi title reactions leading to formation of dipeptides or tetrapeptides. The reaction carried out in a
nonpolar, aprotic solvent (toluene) in combination with ammonium chloride is found
to be advantageous over the commonly used protic ones. — (BONNE, D.;
DEKHANE, M.; ZHU*, J.; Org. Lett. 6 (2004) 25, 4771-4774; Inst. Chim. Subst.
Nat., CNRS, F-91198 Gif-sur-Yvette, Fr.; Eng.) — Steudel
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