Iridium-catalyzed selective N-allylation of hydrazines
摘要:
A highly chemo- and regioselective iridium-catalyzed allylic amination is described. The reaction of various hydrazones and hydrazides with allylic carbonates proceeds at ambient temperature in the presence of an [Ir(COD)Cl](2)/pyridine catalyst, ammonium iodide. and diethylzinc to afford the corresponding N-allylation products in high yields with excellent chemo- and regioselectivities. Only the more nucleophilic nitrogen of a given hydrazine, derivative undergoes the C-N bond formation to yield a branched allylic isomer as the exclusive product. (c) 2005 Elsevier Ltd. All rights reserved.
Iridium-catalyzed selective N-allylation of hydrazines
摘要:
A highly chemo- and regioselective iridium-catalyzed allylic amination is described. The reaction of various hydrazones and hydrazides with allylic carbonates proceeds at ambient temperature in the presence of an [Ir(COD)Cl](2)/pyridine catalyst, ammonium iodide. and diethylzinc to afford the corresponding N-allylation products in high yields with excellent chemo- and regioselectivities. Only the more nucleophilic nitrogen of a given hydrazine, derivative undergoes the C-N bond formation to yield a branched allylic isomer as the exclusive product. (c) 2005 Elsevier Ltd. All rights reserved.