Reactions of 5-trifluoroacetyl-3,4dihydro-2H-pyran with zinc reagents
摘要:
One pot reaction of 5-trifluoroacetyl-3,4-dihydro-2H-pyran with alkyl bromides Rbr in the presence of zinc powder gave the corresponding alcohol (CH2)(3)OCH=CC(R)(CF3)OH (R: CH2CO2Me, 3a; CH2=CHCH2- 3b); 3a readily hydrolysed to the corresponding carboxylic acid under dilute acidic conditions, intramolecular cycle addition of this acid afforded a bicycle lactone. (C) 1999 Elsevier Science S.A. All rights reserved.
One pot reaction of 5-trifluoroacetyl-3,4-dihydro-2H-pyran with alkyl bromides Rbr in the presence of zinc powder gave the corresponding alcohol (CH2)(3)OCH=CC(R)(CF3)OH (R: CH2CO2Me, 3a; CH2=CHCH2- 3b); 3a readily hydrolysed to the corresponding carboxylic acid under dilute acidic conditions, intramolecular cycle addition of this acid afforded a bicycle lactone. (C) 1999 Elsevier Science S.A. All rights reserved.
On the Nucleophilic Reactions of 5-Trifluoroacetyl-3,4-dihydro-2H-pyran