By Michael Harmata
This quantity provides paintings from six diversified teams engaged on a variety of features of cycloaddition chemistry. Jos? Mascare?as offers us a truly attention-grabbing account of the chemistry of &Bgr;-alkoxy-&ggr;-pyrones and similar species. Al Padwa and Chris Staub speak about additional advances in rhodium carbenoid chemistry and the bizarre cycloaddition procedures attainable with those intermediates. greater order cycloadditions mediated through transition metals spotlight Jim Rigby's replace on his group's efforts during this sector. Lily Lee and John Snyder current us with a close account of the indole ring as a dienophile, difficult us to contemplate the untapped capability during this region. Brian Keay and Ian Hunt talk about the intramolecular Diels-Alder reactions of furan; a document that's either top-notch technological know-how, and what can be a nice studying software for college kids who have to see how primary chemical rules can and will be utilized to artificial difficulties. eventually, Kay Brummond introduces us to a brand new model of the Pauson-Khand reactions, one who will doubtless be extra exploited in effective methods by way of her staff good into the long run.
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Additional info for Advances in Cycloaddition, Volume 6 (Advances in Cycloaddition) (Advances in Cycloaddition)
Churchill, M. R. J. Am. Chem. Soc. 1996, 118, 10774. ; Colucci, J. J. Am. Chem. Soc. 1996,118, 10930. ; Jones, D. E. J. Org. Chem. 1997, 62, 1578. (d) Stark, C. B. ; Hoffmann, H. M. R. Angew. , Int. Ed. Engl. 1998, 37, 1267. ; Jones, D. ; Bames, C. L. Tetrahedron Lett. 1999, 40, 1831. 67. (a) Pham, V. ; Charlton, J. L. J. Org. Chem. 1995, 60, 8051. (b) Araldi, G. ; Prakash, K. R. ; Kozikowski, A. P. J. Chem. , Chem. Commun. 1997, 1875. 68. L6pez, E M. S. Thesis, Santiago de Compostela, 1998. 69.
33. (a) Barton, D. H. ; Hulshof, L. A. J. Chem. , Perkin Trans. 1 1977, 1103. (b) West, E G. ; JAI: Greenwich, CT, 1996, Vol. 4, p. 1. 34. Rodrfguez, J. ; Mascarefias, J. L. Unpublished results. 35. ; Mascarefias, J. L. J. Org. Chem. 1993, 58, 5585. 36. Rumbo, A. D. Dissertation, Universidad de Santiago, 1996. 37. ; Mascarefias, J. L. Tetrahedron Lett. 1997, 38, 5885. 38. For a discussion of these effects, see: Sammes, P. ; Weller, D. J. Synthesis 1995, 1205. 39. For recent reviews in the field of temporary silicon connections, see: (a) Bols, M; Scrydstrup, T.
41 The discovery of this new cycloaddition-inducing protocol prompted us to investigate whether it could be extended to intermolecular examples, owing to the aforementioned difficulties associated with the thermal bimolecular pyrone-alkene reaction. The 4-methoxypyrylium salt of ct-deoxykojic acid (45) was readily prepared by mild heating of a chloroform solution of the pyrone with MeOTf. Upon treatment with a hindered base, this salt (77) evolved to the dimer 78, suggesting the formation of the desired oxidopyrylium zwitterion (Scheme 33).
Advances in Cycloaddition, Volume 6 (Advances in Cycloaddition) (Advances in Cycloaddition) by Michael Harmata