Directed Metalation of Diaryl Sulfone 2-Amides and 2-O-Carbamates. Regiospecific General Route to Thioxanthen-9-one 10,10-Dioxides via Anionic Friedel-Crafts and Remote Fries Rearrangement Equivalents
作者:Francis Beaulieu、Victor Snieckus
DOI:10.1021/jo00101a004
日期:1994.11
2-Carboxamido- and 2-O-carbamoyldiaryl sulfones 5, DMG = CONEt(2) and DMG = OCONEt(2), undergo LDA-mediated amide alternate ring migration and cyclization to thioxanthen-9-one 10,10-dioxides 6 and 8, respectively, in a general, synthetically useful reaction.