Tetrahedron Letters p. 7273 - 7276 (1994)
Update date:2022-08-16
Topics:
Goldschmidt, Zeev
Levinger, Shlomo
Gottlieb, Hugo E.
Thermolysis of 3-methyl-4H-1,2-benzoxazine gave the tetracyclic 12a-methyl-7H,12aH,13H-<1,3>benzoxazino<3,2-b><1,2>benzoxazine, which further rearranged to the isomeric 5a-methyl-5aH,11H,13H-<1,3>benzoxazino<2,3-b><1,3>benzoxazine.Thermolysis of the benzoxazinobenzoxazines gave 2-methyl-4H-1,3-benzoxazine, and o-quinone methide which was trapped by ethyl vinyl ether to give 2-ethoxy-dihydrobenzopyran.
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