One-pot synthesis of benzofused 8-oxabicyclo[3.3.1]nonanes via GaCl 3 -mediated cyclocondensation of o -allylbenzaldehydes and 1,3-dicarbonyl synthons.

GaCl 3 -mediated one-pot cyclocondensation of o -allylbenzaldehydes and 1,3-dicarbonyls generates benzofused 8-oxabicyclo[3.3.1]nonanes in moderate to good yields in refluxing MeNO 2 under easy-operational conditions. A plausible mechanism is proposed and discussed here. In the overall reaction process, various metal chloride-promoted conditions were investigated for one-pot cyclocondensation.