Synthetic Communications p. 315 - 322 (2004)
Update date:2022-08-23
Topics:
Koshkin
Fedorova
Lokshin
Guglielmetti
Hamelin
Texier-Boullet
Gromov
The synthesis of the substituted spiroindolinonaphth[2,1-b][1,4]oxazines 3a-e is developed through the condensation of 2-methylene-1,3,3-trimethylindoline derivatives and 1-nitroso-2-naphthol under microwave irradiation. In the same conditions, in presence of morpholine the 6′-morpholinosubstituted compounds 4a, b, d, e are formed. The main advantages of the method are the short reaction time, solvent-free reaction condition, cleaner reaction products and the higher product yields in comparison with known methods of synthesis.
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