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Chem. 2003, 68, 9136; (h) Roberts, B. A.; Strauss, C. R.
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6. Representative examples include (a) Comer, E.; Organ, M.
G. J. Am. Chem. Soc. 2005, 127, 8160; (b) Appukkuttan, P.;
Dehaen, W.; Van der Eycken, E. . Org. Lett. 2005, 7, 2723;
(c) Bargiggia, F.; Murray, W. V. J. Org. Chem. 2005, 70,
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7. Typical procedure: In a microwave vial with a stir-bar, the
catalyst 2 (5 mol %) was dissolved in 0.2 mL CH2Cl2, and
substrates 3–10 (0.1 mmol), dissolved in 0.8 mL CH2Cl2,
were added to the vial and heated at 150 °C for 10 min.
After cooling, the reaction mixture was evaporated under
reduced pressure. The crude product was analyzed by GC
and purified by flash chromatography (silica gel 200–
300 mesh) to afford the corresponding product.
3. (a) Evans, P.; Grigg, R.; Ramzan, M. I.; Sridharan, V.;
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Sakakibara, N.; Kinoshita, A. J. Org. Chem. 1998, 63,
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2130; (d) Furstner, A.; Koch, D.; Langemann, K.; Leitner,
W.; Six, C. Angew. Chem., Int. Ed. 1997, 36, 2466; (e)
Miller, S. J.; Grubbs, R. H. J. Am. Chem. Soc. 1995, 117,
5855; (f) Fu, G. C.; Nguyen, S. T.; Grubbs, R. H. J. Am.
Chem. Soc. 1993, 115, 9856.
4. (a) Yang, Q.; Xiao, W.-J.; Yu, Z. Org. Lett. 2005, 7, 871; (b)
Taber, D. Organic Chemistry Highlights, October 17, 2005.
5. Representative examples include (a) Cao, H.; Xiao, W.-J.
Can. J. Chem. 2005, 83, 826; (b) Efskind, J.; Undheim, K.
Tetrahedron Lett. 2003, 44, 2837; (c) Yang, C.; Murray, W.
V.; Wilson, L. J. Tetrahedron Lett. 2003, 44, 1783; (d)
8. For reports on pyrroles’ formation using RCM reactions,
see: (a) Bujard, M.; Briot, A.; Gouverneur, V.; Mioskowski,
C. Tetrahedron Lett. 1999, 40, 8785; (b) Dieltiens, N.;
Stevens, C. V.; Vos, D. D.; Allaert, B.; Drozdzak, R.;
Verpoort, F. Tetrahedron Lett. 2004, 45, 8995.
`
Declerck, V.; Ribiere, P.; Martinez, J.; Lamaty, F. J. Org.
Chem. 2004, 69, 8372; (e) Mayo, K. G.; Nearhoof, E. H.;
James, J.; Kiddle, J. J. Org. Lett. 2002, 4, 1567; (f) Thanh,
G. V.; Loupy, A. Tetrahedron Lett. 2003, 44, 9091; (g)
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40, 5247.