3-(Phenylthio)phthalide 4 is more readily accessible than the established reagents 1 and 2 and can be engaged in phthalide annulation with comparable efficacy.
References
1.
MitchellA. S., and RussellR. A., Tetrahedron, 1995, 51, 5207.
2.
For the recent uses of phthalide sulfones: CouladourosE. A., PlytaA. F., StrongilosA. T., and PapageorgiouV. P., Tetrahedron Lett., 1997, 38, 7263; F. M. Hauser and M. Zhou, J. Org. Chem., 1996, 61, 5722; D. Mal and N. K. Hazra, Chem. Commun., 1996, 1181; D. Mal and N. K. Hazra, Tetrahedron Lett., 1996, 37, 2641; H. Tso and Y. Chen, J. Chem. Res. (S), 1995, 104.
3.
For the recent uses of cyanophthalides: GeP., and RussellR. A., Tetrahedron, 1997, 57, 17469; J. S. Swenton, J. N. Freskos, P. Dalidowicz and M. L. Kerns, J. Org. Chem., 1996, 61, 459; P. P. Deshpande, K. N. Price and D. C. Baker, J. Org. Chem., 1996, 61, 455; M. D. Shair, T. Y. Yoon, K. K. Mosny, T. C. Chou and S. Danishefsky, J. Am. Chem. Soc., 1996, 118, 9509.
