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0344341601
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3 has been reported to be a highly efficient catalyst for reaction of aromatic aldehydes and methylenecyclohexane. See ref 2b.
-
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46
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0345635996
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note
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This is partly because the homoallylic alcohol product (ene adduct) forms a complex with the Lewis acid promoter to generate a strongly acidic proton. This acidic proton migrates intramolecularly to a double bond of the ene adduct or intermolecularly to a starting styrene derivative to produce a labile cationic intermediate, which triggers various side reactions.
-
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33845376028
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0344341600
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note
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Alternatively, the transformation of ene adducts 2-4 into polycyclic 2-azetidinones 6 can be achieved in one pot upon heating in a sealed tube the homoallylic alcohols in the presence of mesyl chloride and DBU.
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54
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0001155081
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There is in the literature a precedent, described some time ago in our group, for opening β-lactams in the presence of base by a related mechanism. See: Alcaide, B.; Domínguez, G.; Martín-Domenech, A.; Plumet, J.; Monge, A.; Pérez-García, V. Heterocycles 1987, 26, 1461.
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0033804280
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Synthesis of medium-sized rings, notably eight- and nine-membered ring systems, has usually been hampered by entropic/enthalpic factors and transannular interactions between the methylene groups. For reviews, see: (a) Galli, L.; Mandolini, L. Eur. J. Org. Chem. 2000, 3117. (b) Illuminati, G.; Mandolini, L. Acc. Chem. Res. 1981, 14, 95. In view of these difficulties, the synthesis of these structures still remains a partially unsolved problem. For selected reviews on medium-sized ring preparation, see: (c) Yet, L. Chem. Rev. 2000, 100, 2963. (d) Molander, G. Acc. Chem. Res. 1998, 31, 603. (e) Lautens, M. Top. Curr. Chem. 1997, 190, 1.
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0002460703
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Synthesis of medium-sized rings, notably eight- and nine-membered ring systems, has usually been hampered by entropic/enthalpic factors and transannular interactions between the methylene groups. For reviews, see: (a) Galli, L.; Mandolini, L. Eur. J. Org. Chem. 2000, 3117. (b) Illuminati, G.; Mandolini, L. Acc. Chem. Res. 1981, 14, 95. In view of these difficulties, the synthesis of these structures still remains a partially unsolved problem. For selected reviews on medium-sized ring preparation, see: (c) Yet, L. Chem. Rev. 2000, 100, 2963. (d) Molander, G. Acc. Chem. Res. 1998, 31, 603. (e) Lautens, M. Top. Curr. Chem. 1997, 190, 1.
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0034246704
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Synthesis of medium-sized rings, notably eight- and nine-membered ring systems, has usually been hampered by entropic/enthalpic factors and transannular interactions between the methylene groups. For reviews, see: (a) Galli, L.; Mandolini, L. Eur. J. Org. Chem. 2000, 3117. (b) Illuminati, G.; Mandolini, L. Acc. Chem. Res. 1981, 14, 95. In view of these difficulties, the synthesis of these structures still remains a partially unsolved problem. For selected reviews on medium-sized ring preparation, see: (c) Yet, L. Chem. Rev. 2000, 100, 2963. (d) Molander, G. Acc. Chem. Res. 1998, 31, 603. (e) Lautens, M. Top. Curr. Chem. 1997, 190, 1.
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Yet, L.1
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0542397750
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Synthesis of medium-sized rings, notably eight- and nine-membered ring systems, has usually been hampered by entropic/enthalpic factors and transannular interactions between the methylene groups. For reviews, see: (a) Galli, L.; Mandolini, L. Eur. J. Org. Chem. 2000, 3117. (b) Illuminati, G.; Mandolini, L. Acc. Chem. Res. 1981, 14, 95.In view of these difficulties, the synthesis of these structures still remains a partially unsolved problem. For selected reviews on medium-sized ring preparation, see: (c) Yet, L. Chem. Rev. 2000, 100, 2963. (d) Molander, G. Acc. Chem. Res. 1998, 31, 603. (e) Lautens, M. Top. Curr. Chem. 1997, 190, 1.
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Molander, G.1
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0000569013
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Synthesis of medium-sized rings, notably eight- and nine-membered ring systems, has usually been hampered by entropic/enthalpic factors and transannular interactions between the methylene groups. For reviews, see: (a) Galli, L.; Mandolini, L. Eur. J. Org. Chem. 2000, 3117. (b) Illuminati, G.; Mandolini, L. Acc. Chem. Res. 1981, 14, 95.In view of these difficulties, the synthesis of these structures still remains a partially unsolved problem. For selected reviews on medium-sized ring preparation, see: (c) Yet, L. Chem. Rev. 2000, 100, 2963. (d) Molander, G. Acc. Chem. Res. 1998, 31, 603. (e) Lautens, M. Top. Curr. Chem. 1997, 190, 1.
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Lautens, M.1
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60
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0344773446
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note
-
Only examples available have been recently reported by us. See ref 15.
-
-
-
-
61
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0344341599
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note
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Compounds 6, 7, 11, and 12 showed values of coupling constants and NOE enhancements in good agreement with those reported for analogous systems. See refs 14 and 15.
-
-
-
-
62
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0345204050
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note
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Full spectroscopic and analytical data for compounds not included in this Experimental Section are described in Supporting Information.
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