Physical Chemistry

Read e-book online Advances in Cycloaddition. Volume 5 PDF

By M. Harmata

ISBN-10: 0080546382

ISBN-13: 9780080546384

ISBN-10: 0762303468

ISBN-13: 9780762303465

The advance and alertness of cycloaddition method is still on the leading edge of study in artificial natural chemistry. This quantity starts with a assessment of tools to be had for the synthesis of 7-membered earrings and is with paintings on metal-catalyzed cycloadditions. there's then an replace at the cycloaddition chemistry of 2-pyrone, after which a distinct software of photocycloaddition is specified. the ultimate bankruptcy is a dialogue of the most recent explorations of the response of rhodium-stabilized vinyl carbenoids with dienes.

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Soc. 1959, 6522-6523. 66. Pasto, D. ; Chen, A. J. Am. Chem. Soc. 1973,95, 1553. Pasto, D. ; Chen, A. E-T. Tetrahedron Lett. 1973, 713. , unpublished results. 67. Fowler, E W. Angew. , Int. Ed. Engl. 1971, 10, 135. 68. ; Ugi, I. Angew. , Int. Ed. Engl. 1985, 24, 594. 69. ; Lanzendorfer, E J. Am. Chem. Soc. 1984, 106, 373. Baldwin, J. ; Pinschmidt, R. , Jr. Tetrahedron Lett. 1971, 935. 70. ; Podszun, W. Angew. , Int. Ed. Engl. 1969, 8, 976. " Sarel, S. Tetrahedron Lett. 1978,1219. ; Hanafusa, T. Chem.

LOVE 32 (57) PhCH 3, 110 ~ 30 min, 82% 33 34 Table 3. ,.. 5:1 100:0 100:0 0:100 89 82 81 71 36 propane 33 provides a cycloadduct with an angular methyl group in 82% yield (Eq. 57). In one case where the substrate bears double-bond substitution, the initially formed product undergoes further isomerization (Table 3). Despite this minor limitation, the yield of the cycloaddition still exceeds 71%, and the majority of the yields are higher than 80%. B. Intramolecular [5+2] Cycloadditions of Ene-Vi n yl cy cl o p ro pan es Although the [5+2] cycloadditions of alkynes and vinylcyclopropanes service a number of objectives in synthesis, the [5+2] cycloaddition with alkenes also has enormous potential value and in addition presents a remarkable opportunity to address the intrinsic stereoselectivity of the process because two diastereoisomeric products can form.

Berson, J. ; Jones, M. J. Am. Chem. Soc. 1964, 86, 5017. Berson, J. ; Gajewski, J. J. J. Am. Chem. Soc. 1964, 86, 5019. 28. Reinhoudt, D. N. Adv. Het. Chem. 1997, 253. 29. Huffman, M. ; Liebeskind, L. S. J. Am. Chem. Soc. 1993, 115, 4895. 30. ; Dowd, P. Tetrahedron Lett. 1996, 37, 957. 31. Wender, P. ; Filosa, M. P. J. Org. Chem. 1976, 41, 3490. 42 PAUL A. WENDER and JENNIFER A. LOVE 32. Marino, J. ; Kaneko, T. J. Org. Chem. 1974, 39, 3175. 33. ; Morton, H. ; Thies, R. W. Can. J. Chem. 1983, 61, 1226.

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