MAITI, SWARAJ B.;RAY, CHAUDHURI S. R.;CHATTERJEE, AMARESHWAR, SYNTHESIS,(1987) N 9, 806-809
作者:MAITI, SWARAJ B.、RAY, CHAUDHURI S. R.、CHATTERJEE, AMARESHWAR
DOI:——
日期:——
Lewis Acid-Promoted Favorskii-Type Ring Contraction of Some Cyclic α-Bromo Ketones and Their Acetals
作者:Swaraj B. Maiti、S. R. Ray Chaudhuri、Amareshwar Chatterjee
DOI:10.1055/s-1987-28079
日期:——
The α-bromo cycloalkyl aryl ketones 2a-d on heating with zinc chloride in methanol furnished in moderate to good yields the ring-contracted products 3a-d having gem methyl carbomethoxy function. The acetals of the related α-bromo ketones 7a-c, lacking the methyl group on the halogen-bearing carbon atom, afforded in acceptable yields the ring-contracted esters 8a-c when heated in protic solvent. The limitation of the present ring-contraction procedure has been discussed.