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Volumn , Issue 4, 2000, Pages 563-572

The S-thioester enolate/imine condensation: A shortcut to β-lactams

Author keywords

5 Thioester; Enolate; Imine; Stereoselection; Lactams

Indexed keywords

ALUMINUM DERIVATIVE; BETA LACTAM DERIVATIVE; IMINE; ORGANOBORON DERIVATIVE; ORGANOMETALLIC COMPOUND; ORGANOTIN COMPOUND;

EID: 0034006463     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(sici)1099-0690(200002)2000:4<563::aid-ejoc563>3.0.co;2-m     Document Type: Review
Times cited : (117)

References (70)
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  • 6
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    • and references cited therein
    • On the other hand, the imine component of the reaction did not undergo relevant changes until the introduction of N-silylimines. For leading references see: G. Cainelli, D. Giacomini, P. Galletti, A. Gaiba, Synlett 1996, 657-658; and references cited therein.
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    • note
    • Strictly speaking, the α-methylbenzyl residue at the nitrogen in 10 cannot be regarded as a true chiral auxiliary, since its stereogenicity is destroyed upon reductive removal from the β-lactam. Nevertheless, we will use this term for these reagents throughout the text for simplicity and in agreement with common use.
  • 25
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    • This ring closure procedure was later improved by the use of copper(I) triflate: N. Miyachi, F. Kaneda, M. Shibasaki, J. Org. Chem. 1989, 54, 3511-3513.
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  • 28
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    • For another example of this process that involves ester see: K. Hattori, H. Yamamoto, Tetrahedron 1994, 50, 2785-2796.
    • (1994) Tetrahedron , vol.50 , pp. 2785-2796
    • Hattori, K.1    Yamamoto, H.2
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    • It was subsequently shown that the tin enolate of 14 was not formed by the addition of a tertiary amine to a mixture of S-thioester and tin(II) triflate: Y. Sugano, S. Naruta. Chem. Lett. 1989, 1331-1334.
    • (1989) Chem. Lett. , pp. 1331-1334
    • Sugano, Y.1    Naruta, S.2
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    • note
    • The actual nature of these species is not known. For sake of simplicity they will be referred to and shown as trichlorotitanium enolates. The possibility that they exist as "ate" complexes and/or as polynuclear aggregates in solution has been suggested in ref.[24]
  • 37
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    • Several macrolactonization reactions took advantage of the "nucleofugacity" of the 2-pyridylthio group of an S-thioester. For a review on early work see: [27a] T. Mukaiyama, Angew. Chem. Int. Ed. Engl. 1976, 15, 94-103.
    • (1976) Angew. Chem. Int. Ed. Engl. , vol.15 , pp. 94-103
    • Mukaiyama, T.1
  • 38
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    • For recent examples of the use of 5-(2-pyridyl) thioesters in the formation of β-lactones see: [27b] G. Capozzi, S. Roelens, S. Talami, J. Org. Chem. 1993, 58, 7932-7936.
    • (1993) J. Org. Chem. , vol.58 , pp. 7932-7936
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    • unpublished results from these laboratories
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    • (1996) Tetrahedron , vol.52 , pp. 2573-2582
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    • and references cited therein
    • S. Nagayama, S. Kobayashi, J. Org. Chem. 1997, 62, 232-233; and references cited therein.
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    • Nagayama, S.1    Kobayashi, S.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.