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0037156592
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2) incorporation and/or stabilizing the incipient anion through the conjugation with the tetrabutylammonium cation. In the absence of TBAI, poor product yields resulted along with side products stemming from direct N-alkylation. For similar results using TBAI in faciliating carbamate and carbonate formation, see: Salvatore R.N., Chu F., Nagle A.S., Kapxhiou E.A., Cross R.M., Jung K.W. Tetrahedron. 58:2002;3329. Also, tetrabutylammonium bromide (TBAB) and various other onium salts have been utilized in supercritical carbon dioxide for the selective formation of urethanes. See: Yoshida M., Hara N., Okuyama S. Chem. Commun. 2000;151.
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Salvatore, R.N.1
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Jung, K.W.6
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43
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0034695653
-
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2) incorporation and/or stabilizing the incipient anion through the conjugation with the tetrabutylammonium cation. In the absence of TBAI, poor product yields resulted along with side products stemming from direct N-alkylation. For similar results using TBAI in faciliating carbamate and carbonate formation, see: Also, tetrabutylammonium bromide (TBAB) and various other onium salts have been utilized in supercritical carbon dioxide for the selective formation of urethanes. See:
-
2) incorporation and/or stabilizing the incipient anion through the conjugation with the tetrabutylammonium cation. In the absence of TBAI, poor product yields resulted along with side products stemming from direct N-alkylation. For similar results using TBAI in faciliating carbamate and carbonate formation, see: Salvatore R.N., Chu F., Nagle A.S., Kapxhiou E.A., Cross R.M., Jung K.W. Tetrahedron. 58:2002;3329. Also, tetrabutylammonium bromide (TBAB) and various other onium salts have been utilized in supercritical carbon dioxide for the selective formation of urethanes. See: Yoshida M., Hara N., Okuyama S. Chem. Commun. 2000;151.
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Yoshida, M.1
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(a) For other chemoselective N-alkylations using cesium bases, see: Salvatore R.N., Shin S.I., Nagle A.S., Jung K.W. J. Org. Chem. 66:2001;1035
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47
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0001219223
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49
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(f) Salvatore R.N., Schmidt S.E., Shin S.I., Nagle A.S., Worrell J.H., Jung K.W. Tetrahedron Lett. 41:2000;9705
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52
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85030921826
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-
note
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2: C, 67.17; H, 8.86; N, 11.19. Found: C, 67.12; H, 8.82; N, 11.21.
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-
-
-
53
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85030932663
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note
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2: C, 53.30; H, 6.71; N, 10.36. Found: C, 53.26; H, 6.65; N, 10.33.
-
-
-
-
55
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85030933881
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note
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13C NMR, and 2D NMR analysis indicate the product as a single diastereomer.
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