1. Pyrazoled, 2. Hz, and C. Phi, CDCl 3 ): d = 7, H NMR (300 MHz, pp.6025900328-3

C. Nmr, CDCl 3 ): d = 170

1. Pyrazoles, 1. , and C. Phi, 1-methyl-1H-pyr- azole-4-carboxylic acid ethyl ester (9m) Yield: 67%, white solid, pp.117-121

1. Dt, J. Hh-=m, 1. Phit, 1. Hht, 2. et al., 71 (t, 1H, J HH = 1.5 Hz, CH PhI ), H NMR (300 MHz LCMS (EI): m/z = 303, pp.61354-61356

2. and J. Hh, oxazolidin-2-one (11p) Yield: 95%, brown solid, mp: 138?140 °C; 1 H NMR (300 MHz, CDCl 3 ): d = 7, CH PhI, vol.65, issue.4, pp.3148-3150

H. Nmrs, 1. , 4. , 2. , and J. Hh, CDCl 3 ): d = 7, MHz, vol.191, issue.1, pp.35270429-35270432

·. Ch-phbr-amatore and C. , References and notes 1, J. Am. Chem. Soc. J. Org. Chem, vol.1284, issue.59, pp.51-53, 1991.

A. Klapars, X. Huang, and S. L. Buchwald, A General and Efficient Copper Catalyst for the Amidation of Aryl Halides, Journal of the American Chemical Society, vol.124, issue.25, pp.7421-7428, 2002.
DOI : 10.1021/ja0260465

N. J. Withcombe, K. K. Hii, and S. E. Gibson, Advances in the Heck chemistry of aryl bromides and chlorides, Tetrahedron, vol.57, issue.35, pp.7449-7476, 2001.
DOI : 10.1016/S0040-4020(01)00665-2

N. Miyaura and A. Suzuki, Palladium-Catalyzed Cross-Coupling Reactions of Organoboron Compounds, Chemical Reviews, vol.95, issue.7, pp.2457-2483, 1995.
DOI : 10.1021/cr00039a007

A. Klapars, -Arylation of Nitrogen Heterocycles, Journal of the American Chemical Society, vol.123, issue.31, pp.7727-7729, 2001.
DOI : 10.1021/ja016226z

F. Y. Kwong and S. L. Buchwald, Mild and Efficient Copper-Catalyzed Amination of Aryl Bromides with Primary Alkylamines, Organic Letters, vol.5, issue.6, pp.793-796, 2003.
DOI : 10.1021/ol0273396

A. Klapars and S. L. Buchwald, Copper-Catalyzed Halogen Exchange in Aryl Halides:?? An Aromatic Finkelstein Reaction, Journal of the American Chemical Society, vol.124, issue.50, pp.14844-14845, 2002.
DOI : 10.1021/ja028865v

P. Schmidt, Heilmittelchemische Studien in der heterocyclischen Reihe. 25. Mitteilung. Pyrazolo-pyrimidine III Paraxanthin-, Theobromin- und Theophyllin-Analoga der Pyrazolo[3,4-d]pyrimidin-Reihe, Helvetica Chimica Acta, vol.615, issue.1, p.349, 1959.
DOI : 10.1002/hlca.19590420132