Tetrahedron letters

Super fast cobalt carbonyl-mediated synthesis of ureas

PA Enquist, P Nilsson, J Edin, M Larhed

Index: Enquist, Per-Anders; Nilsson, Peter; Edin, Johan; Larhed, Mats Tetrahedron Letters, 2005 , vol. 46, # 19 p. 3335 - 3339

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Citation Number: 33

Abstract

Fast cobalt carbonyl-mediated generation of ureas from primary amines was performed using high-density microwave irradiation. This enhanced method permitted the preparation of symmetrical ureas in good yields and unsymmetrical ureas in moderate yields. The reaction times varied between 10s and 40min. The proposed mechanism for the reaction includes in situ generation of an intermediate isocyanate that subsequently traps the free ...