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17
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4344563685
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note
-
The PMB bromopenem 7 intermediate decomposed to an extent of 30% after standing at 40 °C for 7 days in the solid state while that of the PNB bromopenem 12 did not decompose over 15 days after standing under the same conditions.
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19
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4344567528
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JP-2654076, U.S. Patent 4,977,256, 1990
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0001622595
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A mixture of the bromoacetates 14a and 14b showed same retention time on the normal phase HPLC. The other minor diastereomers 14c and 14d were unstable to isolate but detected by LC-MS. (11) (a) Abiko, A.; Liu, J. F.; Masamune, S. J. Org. Chem. 1996, 61, 2590.
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4344615657
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note
-
3N-promoted aldol-type condensation of 12 did not proceed with nitrile, ester, activated amide such as imidazolide, 1,3-thiazolidine-2-thione amide, and Weinreb's amide.
-
-
-
-
39
-
-
4344664751
-
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note
-
Commercially available zinc dust was activated with 1 N HCl for 15 min and filtered. It was washed well with deionized water and used as such.
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