B. Lal et al., A NOVEL ENTRY INTO 1,2,3,4,5,6-HEXAHYDRO-3-BENZAZOCINE-4,6-DIONE AND ED-2,5,6,7-TETRAHYDRO-4-BENZAZONINE-1,3-(4H)-DIONE, Tetrahedron, 50(30), 1994, pp. 9167-9174
Substituted-1,2,3,4,5,6-hexahydro-3-benzazocine-4, 6-diones(1a-d) and
2-methoxy-2,5,6,7-tetrahydro-4-benzazonine-1,3 -dione 8 were synthesis
ed through an oxidative ring expansion reaction of 6-methylthio-7-subs
tituted-benzo[a]octem (2a-d) and 7-methylthio-8-methoxy-benzo[a]nonem
7 with sodium periodate in isopropanol respectively.