Conjugate addition to 3-arylsulfinylchromones as a synthetic route to homochiral 2-substituted chromanones: scope and limitations
作者:Kevin J Hodgetts、Konstantina I Maragkou、Timothy W Wallace、Robert C.R Wootton
DOI:10.1016/s0040-4020(01)00615-9
日期:2001.7
A route to homochiral 2-substituted chromanones via the diastereoselectiveconjugateaddition of organocopper reagents to 3-(p-tolylsulfinyl)chromones has been improved and used to prepare 2,6-dimethylchromanone (S)-4 and LL-D253α methyl ether (S)-6. The attempted preparation of a 2-phenylchromanone (flavanone) using this strategy was unsuccessful due to the lability of the intermediate 2-phenyl-3
Transition metal-free tunable synthesis of 3-(trifluoromethylthio) and 3-trifluoromethylsulfinyl chromones via domino C H functionalization and chromone annulation of enaminones
The new reactions between -hydroxyphenyl enaminones and Langlois reagent (CFSONa) for the tunable synthesis of 3-(trifluoromethylthio) chromones and 3-trifluoromethylsulfinyl chromones are reported herein. Both type of reactions proceed under transition metal-free conditions. In addition, the conditions for the synthesis of 3-trifluoromethylsulfinyl chromones have also been found to be applicable for