The tandem intermolecular Paternò–Büchi reaction: formation of tetrahydrooxepins
作者:Chee Yong Gan、John N. Lambert
DOI:10.1039/a802922i
日期:——
[2 + 2] photocycloaddition between carbonyl compounds and electron rich alkenes to generate oxetane products. By the introduction of substituted cyclopropyl rings to the alkene components, the utility of this reaction has been extended to facilitate the synthesis of substituted tetrahydrooxepins. It is proposed that initial addition of oxygen radicals to cyclopropyl enol ethers generates cyclopropylmethyl
Provided are analgesic compounds, and salts thereof, of formula: (I) wherein A is: (A) Additionally, pharmaceutical formulations and methods of use employing the above compounds are provided.