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Treatment of bis-spirocyclopropanated isoxazolidines 551 with trifluoroacetic acid in acetonitrile furnishes 3-spiro-cyclopropanated azetidin-2-ones 552 in excellent yields (Equation 226) 2004EJ04158 . [Pg.83]

Further transformations of five-membered rings into nonaromatic 1,2,4-triazines have been reported.212-226... [Pg.618]

See other pages where Transformation of five-membered rings is mentioned: [Pg.34] [Pg.83]