Preparation of seven-membered and medium-ring lactones by iodo lactonization
摘要:
Iodo lactonization of 6-heptenoic acid using bis(sym-collidine)iodine(I) hexafluorophosphate in methylene chloride led in high yield to 6-(iodomethyl)-hexanolide while with longer omega-ethylenic carboxylic acids the corresponding lactones were obtained in low yields; however, the presence of an oxygen atom in the carbon chain allowed the formation of medium-ring iodo lactones.
Oxygen Effect in the Iodo Lactonization of Unsaturated Carboxylic Acids Leading to 7- to 12-Membered Ring Lactones
摘要:
The reaction of omega-alkenoic acids with bis(sym-collidine)iodine(I) hexafluorophosphate led to (iodomethyl) epsilon-caprolactones in good yields (49-75%) and medium ring iodo lactones in low yields (4-5%). The latter compounds have been obtained after introduction of an oxygen atom in the carbon chain. The position of the oxygen appeared important. This oxygen effect was explained by the stabilization of the intermediate iodonium ion by the oxygen atom.
Oxygen Effect in the Iodo Lactonization of Unsaturated Carboxylic Acids Leading to 7- to 12-Membered Ring Lactones
作者:Bruno Simonot、Gerard Rousseau
DOI:10.1021/jo00099a019
日期:1994.10
The reaction of omega-alkenoic acids with bis(sym-collidine)iodine(I) hexafluorophosphate led to (iodomethyl) epsilon-caprolactones in good yields (49-75%) and medium ring iodo lactones in low yields (4-5%). The latter compounds have been obtained after introduction of an oxygen atom in the carbon chain. The position of the oxygen appeared important. This oxygen effect was explained by the stabilization of the intermediate iodonium ion by the oxygen atom.
Preparation of seven-membered and medium-ring lactones by iodo lactonization
作者:Bruno Simonot、Gerard Rousseau
DOI:10.1021/jo00053a002
日期:1993.1
Iodo lactonization of 6-heptenoic acid using bis(sym-collidine)iodine(I) hexafluorophosphate in methylene chloride led in high yield to 6-(iodomethyl)-hexanolide while with longer omega-ethylenic carboxylic acids the corresponding lactones were obtained in low yields; however, the presence of an oxygen atom in the carbon chain allowed the formation of medium-ring iodo lactones.