SYNTHESIS OF TETRAHYDROAZOCINO-1,2-BENZOQUINONES AND DIHYDROAZEPINO-1,2-BENZOQUINONES VIA AMINO-CLAISEN REARRANGEMENT OF 4-(2-VINYL-AZETIDINO AND AZIRIDINO)-1,2-BENZOQUINONES
L. Viallon et al., SYNTHESIS OF TETRAHYDROAZOCINO-1,2-BENZOQUINONES AND DIHYDROAZEPINO-1,2-BENZOQUINONES VIA AMINO-CLAISEN REARRANGEMENT OF 4-(2-VINYL-AZETIDINO AND AZIRIDINO)-1,2-BENZOQUINONES, Tetrahedron letters, 36(27), 1995, pp. 4787-4790
Amino-Claisen rearrangement of 4-(2-vinyl- azetidino or aziridino)-5-m
ethoxy-1,2-benzoquinones 3a,b selectively gives rise to the new tetrah
ydroazocino - quinone 4a or dihydroazepino - quinone 4b respectively.
Based on paramethoxyphenol as starting material, overall yields for th
e 3 steps synthesis of heterobicyclic quinones 4a, b are 58 and 52%.