POCl3-mediated synthesis of hydrolysis-prone 2-trifluoroethylbenzimidazoles
摘要:
Loss of a trifluoromethyl group has been observed as an unproductive side reaction in the formation of 2-trifluoroethylbenzimidazoles. A hydrolytic mechanism for this transformation is proposed that is consistent with evidence for the identity of reaction intermediates. Cyclodehydration with POCl3 suppresses hydrolysis of the trifluoromethyl group and provides 2-trifluoroethylbenzimidazoles in good yields. (C) 2008 Elsevier Ltd. All rights reserved.
POCl3-mediated synthesis of hydrolysis-prone 2-trifluoroethylbenzimidazoles
摘要:
Loss of a trifluoromethyl group has been observed as an unproductive side reaction in the formation of 2-trifluoroethylbenzimidazoles. A hydrolytic mechanism for this transformation is proposed that is consistent with evidence for the identity of reaction intermediates. Cyclodehydration with POCl3 suppresses hydrolysis of the trifluoromethyl group and provides 2-trifluoroethylbenzimidazoles in good yields. (C) 2008 Elsevier Ltd. All rights reserved.