Reactions of Azines. 10. Synthesis of 4H,6H-Pyrazolooxazol-4-ylidines, 4H-Pyrrolopyrazol-4-ones, and/or 4H,8H-Pyrazolooxazepin-4-ones

Article abstract of DOI:10.1021/jo00383a029

The phosphoranes 1 underwent the Wittig reaction with the furandione 11, exclusively at the lactone carbonyl, to produce the azine vinylogous lactones 21 in high yields.The structure of the azine vinylogous lactone 21d was confirmed by X-ray analysis.Ther