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LeBel has shown that the Z and E isomerizations are possible when a solution of toluene was heated at reflux: LeBel, N.A.; Banucci, E.G. Intramolecular nitroneolefin cycloadditions. The stereochemistry of hexahydro-2,1-benzisoxazoline formation. J. Org. Chem. 1971, 36, 2440-2448.
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The importance of pre-existing heterocycles in selected positions and orientations on acyclic precursors for successful carbocyclization processes has been demostrated in our laboratory: a) Marco-Contelles, J.; Ruiz, P.; Martínez, L.; Martínez-Grau, A. Strategies and tactics for free radical carbocyclization: synthesis of polyfunctionalized cyclopentanoid molecules from carbohydrates. Tetrahedron 1993, 49, 6669-6694; b) Marco-Contelles, J.; Bernabé, M.; Ayala, D.; Sánchez, B. 6-endo-dig free radical carbocyclizations: a new strategy for the synthesis of cyclitols. J. Org. Chem. 1994, 59, 1234-1235. For an application of the results reported in this paper, see: c) Gómez, A.M.; Danelón, G.O.; Valverde, S.; López, J.C. Regio- and stereocontrolled 6-endo-trig radical cyclization of vinyl radicals: a novel entry to carbasugars from carbohydrates. J. Org. Chem. 1998, 63, 9626-9627 (Corrigendum: J. Org. Chem. 1999, 64, 7280).
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The importance of pre-existing heterocycles in selected positions and orientations on acyclic precursors for successful carbocyclization processes has been demostrated in our laboratory: a) Marco-Contelles, J.; Ruiz, P.; Martínez, L.; Martínez-Grau, A. Strategies and tactics for free radical carbocyclization: synthesis of polyfunctionalized cyclopentanoid molecules from carbohydrates. Tetrahedron 1993, 49, 6669-6694; b) Marco-Contelles, J.; Bernabé, M.; Ayala, D.; Sánchez, B. 6-endo-dig free radical carbocyclizations: a new strategy for the synthesis of cyclitols. J. Org. Chem. 1994, 59, 1234-1235. For an application of the results reported in this paper, see: c) Gómez, A.M.; Danelón, G.O.; Valverde, S.; López, J.C. Regio- and stereocontrolled 6-endo-trig radical cyclization of vinyl radicals: a novel entry to carbasugars from carbohydrates. J. Org. Chem. 1998, 63, 9626-9627 (Corrigendum: J. Org. Chem. 1999, 64, 7280).
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Corrigendum: J. Org. Chem. 1999, 64, 7280
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The importance of pre-existing heterocycles in selected positions and orientations on acyclic precursors for successful carbocyclization processes has been demostrated in our laboratory: a) Marco-Contelles, J.; Ruiz, P.; Martínez, L.; Martínez-Grau, A. Strategies and tactics for free radical carbocyclization: synthesis of polyfunctionalized cyclopentanoid molecules from carbohydrates. Tetrahedron 1993, 49, 6669-6694; b) Marco-Contelles, J.; Bernabé, M.; Ayala, D.; Sánchez, B. 6-endo-dig free radical carbocyclizations: a new strategy for the synthesis of cyclitols. J. Org. Chem. 1994, 59, 1234-1235. For an application of the results reported in this paper, see: c) Gómez, A.M.; Danelón, G.O.; Valverde, S.; López, J.C. Regio- and stereocontrolled 6-endo-trig radical cyclization of vinyl radicals: a novel entry to carbasugars from carbohydrates. J. Org. Chem. 1998, 63, 9626-9627 (Corrigendum: J. Org. Chem. 1999, 64, 7280).
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