Preparation and nickel-catalyzed coupling reactions of divinylic selenides
摘要:
The preparation of divinylic selenides by the reaction of selenium bis-phosphonate with aromatic aldehydes is described. The nickel-catalyzed cross coupling of the divinylic selenides with Grignard reagents was also studied. (C) 2002 Elsevier Science Ltd. All rights reserved.
Preparation and nickel-catalyzed coupling reactions of divinylic selenides
摘要:
The preparation of divinylic selenides by the reaction of selenium bis-phosphonate with aromatic aldehydes is described. The nickel-catalyzed cross coupling of the divinylic selenides with Grignard reagents was also studied. (C) 2002 Elsevier Science Ltd. All rights reserved.
A simple and efficient protocol to prepare divinyl selenides has been developed by the regio- and stereoselective addition of sodium selenidespecies to aryl alkynes. The nucleophilic species was generates in situ, from the reaction of elemental selenium with NaBH₄, utilizing PEG-400 as the solvent. Several divinyl selenides were obtained in moderate to excellent yields with selectivity for the (Z