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Volumn 68, Issue 8, 2003, Pages 3106-3111

Lewis acid-promoted intermolecular carbonyl-ene reaction of enantiopure 4-oxoazetidine-2-carbaldehydes. Rapid entry to novel fused polycyclic β-lactams

Author keywords

[No Author keywords available]

Indexed keywords

ALCOHOLS; CHEMICAL REACTIONS; OLEFINS; STEREOCHEMISTRY;

EID: 0344519741     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo0340509     Document Type: Article
Times cited : (26)

References (62)
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    • note
    • 3 has been reported to be a highly efficient catalyst for reaction of aromatic aldehydes and methylenecyclohexane. See ref 2b.
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    • note
    • 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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    • 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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    • 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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    • 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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    • 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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    • 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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    • note
    • Only examples available have been recently reported by us. See ref 15.
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    • note
    • 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.
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    • note
    • Full spectroscopic and analytical data for compounds not included in this Experimental Section are described in Supporting Information.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.