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40
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0343171901
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Predominant formation of β-lactams would reflect that the ring closure reaction proceeds at a greater rate on the geminal (i.e. dimethyl) substitution: P. D. Bartlett, J. Chem. Educ., 1953, 30, 22; T. C. Bruice and U. K. Pandit, J. Am. Chem. Soc., 1960, 82, 5858. Hydrolysis of 7 and subsequent esterfication gave 4, thus confirming the assignment of structure (4).
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Bartlett, P.D.1
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41
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85023100437
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Predominant formation of β-lactams would reflect that the ring closure reaction proceeds at a greater rate on the geminal (i.e. dimethyl) substitution: P. D. Bartlett, J. Chem. Educ., 1953, 30, 22; T. C. Bruice and U. K. Pandit, J. Am. Chem. Soc., 1960, 82, 5858. Hydrolysis of 7 and subsequent esterfication gave 4, thus confirming the assignment of structure (4).
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Bruice, T.C.1
Pandit, U.K.2
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37049071834
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For example, see: P. Andreoli, G. Cainelli, M. Contento, D. Giacomini, G. Martelli, and M. Panunzio, J. Chem. Soc., Perkin Trans. I, 1988, 945.
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Panunzio, M.6
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43
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0342737502
-
-
note
-
3).
-
-
-
-
44
-
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0342737500
-
-
note
-
Stereochemical assignments are by analogy with the results obtained with 2 and 6.
-
-
-
-
45
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0040981336
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-
2O and/or in the presence of HMPA, β-amino esters were also produced in variable yield. Judging from preliminary experiments in the presence of HMPA, the ratio of syn-and anti-esters was reversed, affording the anti-β-amino esters preferentially. For example, a report of the reversal in diastereoselection in HMPA - THF, see: T. Chiba, M. Nagatsuma, and T. Nakai, Chem. Lett., 1984, 1927.
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47
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33947468884
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H. E. Zimmerman and M. D. Traxler, J. Am. Chem. Soc., 1957, 79, 1920. For example, S. R. Chemler and W. R. Roush, Tetrahedron Lett., 1999, 4643; R. A. Batey, A. N. Thadani, and D. V. Smil, Tetrahedron Lett., 1999, 4289.
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Zimmerman, H.E.1
Traxler, M.D.2
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48
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0033580956
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H. E. Zimmerman and M. D. Traxler, J. Am. Chem. Soc., 1957, 79, 1920. For example, S. R. Chemler and W. R. Roush, Tetrahedron Lett., 1999, 4643; R. A. Batey, A. N. Thadani, and D. V. Smil, Tetrahedron Lett., 1999, 4289.
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Chemler, S.R.1
Roush, W.R.2
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49
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0033522938
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H. E. Zimmerman and M. D. Traxler, J. Am. Chem. Soc., 1957, 79, 1920. For example, S. R. Chemler and W. R. Roush, Tetrahedron Lett., 1999, 4643; R. A. Batey, A. N. Thadani, and D. V. Smil, Tetrahedron Lett., 1999, 4289.
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Batey, R.A.1
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Smil, D.V.3
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