Regiospecific acylation of acetals. A convenient method to obtain β-methoxyvinyl trichloromethyl ketones
摘要:
The regiochemistry of the acylation of enol ethers, generated in situ, from acetals of unsymmetrical ketones is reported. These results demonstrate a convenient one-pot method to obtain a series of beta-methoxyvinyl trichloromethyl ketones [CCl3COCH=C(OMe)R, where R=Et, n-Bu, i-Pr, (CH2)(2)C(OMe)=CHC(O)CCl3 and (CH2)(5)CO2CH3)] in high yields. (C) 1999 Elsevier Science Ltd. All rights reserved.