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1842796357
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note
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1=17.5 Hz), 4.16 (m, 1H), 4.62 (s, 2H), 5.11 (s, 1H), 6.93 (d, 2H, J=8.0 Hz), 7.32 (d, 2H, J=8.0 Hz). To avoid the preparation of cesium carbonate salt in hydromethanolic solution, we developed an alternative procedure: cesium carbonate (0.853 g, 2.63 mmol) was added to Boc-Asn (0.205 g, 0.88 mmol) in 5 mL of DMF. The mixture was stirred for 2 days at room temperature to complete the salt formation. Then benzyl bromide (42 μL, 2.2 mmol) was added. After stirring for 6 h at room temperature, the same treatment was applied. 1-Benzyl-3-Bocaminosuccinimide 1a, was isolated in a similar yield.
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1842695488
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note
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3CN.
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23
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1842745856
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note
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-1.
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24
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1842796358
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note
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3) δ (ppm): 2.12 (m, 1H), 2.40 (m, 1H), 3.25 (m, 2H), 4.05 (t, 1H, J=9 Hz), 4.31 (d, 1H J=15 Hz), 4.38 (d, 1H J=15 Hz), 7.20-7.35 (m, 5H), 8.4 (br s, 3H).
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