An unexpected highly diastereoselective double Baylis–Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines with methyl vinyl ketone
摘要:
Aza-Baylis-Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines 1 with methyl vinyl ketone (MVK) was studied. It was found that both the used Lewis base and solvent can significantly affect the reaction. Using triphenylphosphine as a Lewis base, the reaction of 1 with MVK proceeded smoothly to give the normal Baylis-Hillman adduct 2 along with the double Baylis-Hillman adduct 3 as by-product in THE When 1,4-diazabicyclo [2.2.2] octane was used as a Lewis base in DMF, the aza-Baylis-Hillman reaction of 1 with MVK gave the double aza-Baylis-Hillman adduct 3 exclusively in moderate to good yields with excellent diastereoselectivities. The double Baylis-Hillman adduct 3 was conveniently converted to fluorine-containing 4-alkylidene-2-cyclohexen-1-ones under mild reaction conditions in good yields. (c) 2005 Elsevier Ltd. All rights reserved.
An unexpected highly diastereoselective double Baylis–Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines with methyl vinyl ketone
摘要:
Aza-Baylis-Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines 1 with methyl vinyl ketone (MVK) was studied. It was found that both the used Lewis base and solvent can significantly affect the reaction. Using triphenylphosphine as a Lewis base, the reaction of 1 with MVK proceeded smoothly to give the normal Baylis-Hillman adduct 2 along with the double Baylis-Hillman adduct 3 as by-product in THE When 1,4-diazabicyclo [2.2.2] octane was used as a Lewis base in DMF, the aza-Baylis-Hillman reaction of 1 with MVK gave the double aza-Baylis-Hillman adduct 3 exclusively in moderate to good yields with excellent diastereoselectivities. The double Baylis-Hillman adduct 3 was conveniently converted to fluorine-containing 4-alkylidene-2-cyclohexen-1-ones under mild reaction conditions in good yields. (c) 2005 Elsevier Ltd. All rights reserved.
An unexpected highly diastereoselective double Baylis–Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines with methyl vinyl ketone
作者:Xinyuan Liu、Jinwei Zhao、Guifang Jin、Gang Zhao、Shizheng Zhu、Shaowu Wang
DOI:10.1016/j.tet.2005.01.130
日期:2005.4
Aza-Baylis-Hillman reaction of per- (or poly)fluorophenyl aromatic aldimines 1 with methyl vinyl ketone (MVK) was studied. It was found that both the used Lewis base and solvent can significantly affect the reaction. Using triphenylphosphine as a Lewis base, the reaction of 1 with MVK proceeded smoothly to give the normal Baylis-Hillman adduct 2 along with the double Baylis-Hillman adduct 3 as by-product in THE When 1,4-diazabicyclo [2.2.2] octane was used as a Lewis base in DMF, the aza-Baylis-Hillman reaction of 1 with MVK gave the double aza-Baylis-Hillman adduct 3 exclusively in moderate to good yields with excellent diastereoselectivities. The double Baylis-Hillman adduct 3 was conveniently converted to fluorine-containing 4-alkylidene-2-cyclohexen-1-ones under mild reaction conditions in good yields. (c) 2005 Elsevier Ltd. All rights reserved.