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1442267988
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note
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Benzylidene-4,4,5,5-tetramethyl-1,3-dioxolane, which would be formed by the elimination of 4, was not detected in the crude product.
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47
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1442267990
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note
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3.
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48
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33847799422
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The relative configuration of 9a was determined by the comparison of their melting points, 126-127 °C for the major isomer and 120-120.5 °C for the minor isomer, to that reported for (RS,SR)-9a, 118-120 °C, in: Sharpless, K. B.; Chong, A. O.; Oshima, K. J. Org. Chem. 1976, 41, 177-179.
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49
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0011682094
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A carbon radical having a π-substituent, such as an α-alkoxyalkyl radical, favors a pyramidal structure: (a) Bernard, F.; Cherry, W.; Shaik, S.; Epiotis, N. D. J. Am. Chem. Soc. 1978, 100, 1352-1356.
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Bernard, F.1
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51
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1442317047
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note
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The relative configuration (RS,RS) of the substituents on the dioxolane ring was confirmed by the nOe between the 5-methyl protons and the methine proton at the 4-position for 11a or the 4-methyl protons for 11b.
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52
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0037071940
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The relative configuration of 13 was tentatively assigned as shown based on this precedent: Harris, J. M.; Padwa, A. Org. Lett. 2002, 4, 2029-2031.
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(b) Koulocheri, S. D.; Magiatis, P.; Skaltsounis, A.-L.; Haroutounian, S. A. Tetrahedron 2000, 56, 6135-6141.
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Koulocheri, S.D.1
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(c) Yang, C.-F.; Xu, Y.-M.; Liao, L.-X.; Zhou, W.-S. Tetrahedron Lett. 1998, 39, 9227-9228.
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Yang, C.-F.1
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56
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85044492982
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For a review, see: (d) Ciufollini, M. A.; Hermann, A. Y. W.; Dong, Q.; Shimizu, T.; Swaminathan, S.; Xi, N. Synlett 1998, 105-114. See also ref 13.
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(b) Mereyala, H. B.; Gadikota, R. R.; Sunder, K. S.; Shailaja, S. Tetrahedron 2000, 56, 3021-3026.
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Mereyala, H.B.1
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Kingsbury, J. S.; Harrity, J. P. A.; Bonitatebus, P. J., Jr.; Hoveyda, A. H. J. Am. Chem. Soc. 1999, 121, 791-799.
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