Acidic ionic liquid-catalyzed homologation of the polyene chain in α,β-enals (polyenals)
摘要:
An efficient green-chemistry synthesis of conjugated polyenals from alpha,beta-enals, orthoesters, and alkyl vinyl ethers promoted by acidic ionic liquid [emim][HSO4] is described. The ionic liquid can be reused at least three times without any decrease in product yields. (C) 2010 Elsevier Ltd. All rights reserved.
The two carbon homologation of carbonylcompounds to α,β-unsaturated aldehydes is achieved by the Wittig-Horner reaction with N-methoxy N-methyl diethylphosphonoacetamide followed by lithiumaluminumhydridereduction.