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Kuo, M. S.; Zielinski, R. J.; Cialdella, J. I.; Marschke, C. K.; Dupuis, M. J.; Li, G. P.; Kloosterman, D. A.; Spilmann, C. H.; Marshall, V. P. J. Am. Chem. Soc. 1995, 117, 10629-10634.
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For the total synthesis of U-106305, see: (a) Barrett, A. G. M.; Hamprecht, D.; White, A. J. P.; Williams, D. J. J. Am. Chem. Soc. 1996, 118, 7863-7864.
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(b) Barrett, A. G. M.; Hamprecht, D.; White, A. J. P.; Williams, D. J. J. Am. Chem. Soc. 1997, 119, 8608-8615.
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9
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0030932220
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For alternative approaches to oligocyclopropane structural units using modified Simmons-Smith technology on cyclopropyl-substituted alkenes, see: (a) McDonald, W. S.; Verbicky, C. A.; Zercher, C. K. J. Org. Chem. 1997, 63, 1215-1222.
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(b) Therberge, C. R.; Verbicky, C. A.; Zercher, C. K. J. Org. Chem. 1996, 62, 8792-8798.
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For additional examples oligocyclopropane preparation, see: (a) Itoh, T.; Emoto, S.; Kondo, M.; Tetrahedron 1998, 54, 5225-5232.
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For examples of chemical approaches to cyclopropanes via cyclo-propylcarbinyl cationic intermediates, see: (a) Krief, A.; Provins, L. Synlett 1997, 505-507.
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0003245764
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Schaumann has previously reported the preparation of vinylcyclopropanes from similar starting materials through an allylic anion-mediated process. For a lead reference, see: Schaumann, E.; Kirschning, A.; Narjes, F. J. Org. Chem. 1991, 56, 717-723.
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For the preparation of olefinic diols via similar silyloxycycloalkenes, see: Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757-4760. For the preparation of tetrahydrofurans and pyrans via similar silyloxycycloalkenes, see: Meyer, C.; Cossy, J. Tetrahedron Lett. 1997, 38, 7861-7864.
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Chang, S.1
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0030840132
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For the preparation of olefinic diols via similar silyloxycycloalkenes, see: Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757-4760. For the preparation of tetrahydrofurans and pyrans via similar silyloxycycloalkenes, see: Meyer, C.; Cossy, J. Tetrahedron Lett. 1997, 38, 7861-7864.
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The relative stereochemistry of the diastereomeric homoallylic alcohols 9a and 9b was determined by chemical correlation to previously reported compounds. See: Mohapatra, D. K.; Datta, A. J. Org. Chem. 1998, 63, 642-646.
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Datta, A.2
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85034131190
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note
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(a) We have more recently repeated these experiments and have shown that the phenoxy series is ∼80% stereospecific. (b) We do not believe that the benzyl ether has an effect on the initial cyclopropanation reaction (7 to 8, Scheme 2).
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33
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0002846538
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The "classic" and "nonclassic" carbocationic behavior of homoallyl-cyclopropyl carbinyl-cyclobutyl cations has recently been reviewed: Olah, G. A.; Reddy, V. P.; Surya Prakash, G. K. Chem. Rev. 1992, 92. 69-95. For a seminal discussion of these intermediates, see: Roberts J. D.; Mazur, R. H. J. Am. Chem. Soc. 1951, 73, 2509.
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Olah, G.A.1
Reddy, V.P.2
Surya Prakash, G.K.3
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34
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0000014060
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The "classic" and "nonclassic" carbocationic behavior of homoallyl-cyclopropyl carbinyl-cyclobutyl cations has recently been reviewed: Olah, G. A.; Reddy, V. P.; Surya Prakash, G. K. Chem. Rev. 1992, 92. 69-95. For a seminal discussion of these intermediates, see: Roberts J. D.; Mazur, R. H. J. Am. Chem. Soc. 1951, 73, 2509.
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Jeffery, T.; Gueugnot, S.; Linstrumelle, G. Tetrahedron Lett. 1992, 33, 5757-5760.
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