Enol ethers and acetals: acylation with dichloroacetyl, acetyl and benzoyl chloride in ionic liquid medium

Abstract Synthesis of 4-alkoxy-1,1-dichloro-3-alken-2-ones [CHCl 2 C(O)C(R 2 ) C(R 1 )-OR, where R, R 1 , R 2  = Et, H, H; Me, Me, H; Et, H, Me; Me, –(CH 2 ) 2 –; Me, –(CH 2 ) 3 –; Et, Et, H; Et, Bu, H; Et, i -Pr, H; Et, i -Bu, H; Me, Ph, H; Me, thien-2-yl, H] from acylation of enol ethers and acetals with dichloroacetyl chloride, in ionic liquid ([BMIM][BF 4 ] or [BMIM][PF 6 ]) is reported. The synthesis of alkenones [R 3 –C(O)C(R 2 ) C(R 1 )-OR], where R/R 1 /R 2 /R 3  = Et/H/H/Ph, t -Bu/H/H/Ph, Me/-(CH 2 ) 4 /Ph, Me/-(CH 2 ) 4 /Me] from the reaction of enol ethers with benzoyl chloride or acetyl chloride, in ionic liquid [BMIM][BF 4 ], is also reported. Last products are described for the first time.