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Fujisawa, T.1
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0000518455
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and references cited therein
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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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For recent reports on the synthesis of S-thioesters see: [4a] T. Inoue, T. Takeda, N. Kambe, A. Ogawa, I. Ryu, N. Sonoda, J. Org. Chem. 1994, 59, 5824-5827.
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0342309537
-
-
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.
-
-
-
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25
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0024405003
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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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Miyachi, N.1
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0026069534
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For an improved synthesis of a precursor of (+)-PS-5 see: M. Mori, K. Kagechika, H. Sasai, M. Shibasaki, Tetrahedron 1991, 47, 531-540.
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27
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E. J. Corey, C. P. Decicco, R. C. Newbold, Tetrahedron Lett. 1991, 32, 5287-5290.
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0028215543
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For another example of this process that involves ester see: K. Hattori, H. Yamamoto, Tetrahedron 1994, 50, 2785-2796.
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Hattori, K.1
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30
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0011666171
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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.
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Sugano, Y.1
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0000504848
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D. A. Evans, M. T. Bilodeau, T. C. Somers, J. Clardy, D. Cherry, Y. Kato, J. Org. Chem. 1991, 56, 5750-5752; and references cited therein.
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0026004927
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R. Annunziata, M. Cinquini, F. Cozzi, P. G. Cozzi, E. Consolandi, Tetrahedron 1991, 47, 7897-7910.
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36
-
-
0343179072
-
-
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
-
-
84982423873
-
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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.
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Mukaiyama, T.1
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38
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0027745960
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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.
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M. Cinquini, F. Cozzi, P. G. Cozzi, E. Consolandi, Tetrahedron 1991, 47, 8767-8774.
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41
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0040979337
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