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49649090479
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Representative Procedure; Synthesis of 1-Isopropyl-5,5- dimethylpiperidine-2,3-dione (6c, To (Z)-methyl 5-isopropylamino-2-methoxy- 4,4-dimethyl-2-pentenoate(4c; 0.50 g, 2.2 mmol)7 was added coned sulfuric acid (0.6 mL, 21.6 mmol) dropwise. The resulting homogeneous mixture was stirred at r.t. for 1 h and subsequently cooled to O °C. NaOH (1 M) was added cautiously dropwise until pH 10, the resulting aqueous phase was extracted with CH2Cl2 (3x5 mL) and the combined organic phases were dried (MgSO4, After filtration and evaporation of the solvent, crude 5,5-dimethyl-l-isopropylpiperidine-2,3-dione (6c) was purified by filtration over silica gel using EtOAc. 1-Isopropyl-5,5-dimethylpiperidine-2, 3-dione (6c, yield: 50, 1H NMR (270 MHz, CDCl3, δ, 1.13 (s, 6 H, CqMe2, 1.18 (d, J= 6.6 Hz, 6 H, CHCe2, 2.54 [s, 2 H, C(O)CH2, 3.22 s, 2 H
-
2: C, 65.54; H, 9.35; N, 7.64. Found: C, 65.43; H, 9.51; N, 7.53.
-
-
-
-
40
-
-
0037459890
-
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(b) Weintraub, P. M.; Sabol, J. S.; Kane, J. M.; Borcherding, D. R. Tetrahedron 2003, 59, 2953.
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0033978533
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Jung, A.1
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46
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0345435969
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(c) Forns, P.; Fernández, M. M.; Diez, A.; Rubiralta, M.; Cherrier, M. P.; Bonin, M.; Quirion, J.-C. Synthesis 1999, 258.
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49649095269
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Herdeis, C.; Bissinger, G. Z. Naturforsch., B 1987, 42, 785.
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Z. Naturforsch., B
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Herdeis, C.1
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49
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0019254820
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(b) Edelstein, F.; Avramoff, M.; Shtacher, G.; Teitz, Y. Eur. J. Med. Chem. 1980, 15, 566.
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Edelstein, F.1
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50
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-
33745123026
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-
(c) Pinto, D. J. P.; Orwat, M. J.; Quan, M. L.; Han, Q.; Galemmo, R. A.; Amparo, E.; Wells, B.; Ellis, C.; He, M. Y.; Alexander, R. S.; Rossi, K. A.; Smallwood, A.; Wong, P. C.; Luettgen, J. M.; Rendina, A. R.; Knabb, R. M.; Mersinger, L.; Kettner, C.; Bai, S.; He, K.; Wexler, R. R.; Lam, P. Y. S. Bioorg. Med. Chem. Lett. 2006, 16, 4141.
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Pinto, D.J.P.1
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Quan, M.L.3
Han, Q.4
Galemmo, R.A.5
Amparo, E.6
Wells, B.7
Ellis, C.8
He, M.Y.9
Alexander, R.S.10
Rossi, K.A.11
Smallwood, A.12
Wong, P.C.13
Luettgen, J.M.14
Rendina, A.R.15
Knabb, R.M.16
Mersinger, L.17
Kettner, C.18
Bai, S.19
He, K.20
Wexler, R.R.21
Lam, P.Y.S.22
more..
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51
-
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33748788587
-
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(d) Pinto, D. J. P.; Galemmo, R. A.; Quan, M. L.; Orwat, M. J.; Clark, C.; Li, R.; Wells, B.; Woerner, F.; Alexander, R. S.; Rossi, K. A.; Smallwood, A.; Wong, P. C.; Luettgen, J. M.; Rendina, A. R.; Knabb, R. M.; He, K.; Wexler, R. R.; Lam, P. Y. S. Bioorg. Med. Chem. Lett. 2006, 16, 5584.
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Pinto, D.J.P.1
Galemmo, R.A.2
Quan, M.L.3
Orwat, M.J.4
Clark, C.5
Li, R.6
Wells, B.7
Woerner, F.8
Alexander, R.S.9
Rossi, K.A.10
Smallwood, A.11
Wong, P.C.12
Luettgen, J.M.13
Rendina, A.R.14
Knabb, R.M.15
He, K.16
Wexler, R.R.17
Lam, P.Y.S.18
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52
-
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49649127240
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Methyl 2-Hydroxy-4-isopropylamino-4-methyl- pentanoate (7a, yield: 86, A7Rf, CH2Cl2-MeOH, 19:1, 1HNMR(270 MHz, CDCl3, δ, 1.09, 1.11(2 x d, J= 6.3 Hz, 6 H, Me2CH, 1.19,1.27 (2 x s, 6 H, C qMe2, 1.72 (d, J, 6.6 Hz, 2 H, C qCH2, 2.99 (sept, J= 6.3 Hz, 1 H, CAMe 2, 3.75 (s, 3 H, OMe, 4.58 (t, J= 6.6 Hz, 1 H, OCH, 13C NMR (68 MHz, CDCl3, δ, 24.21, 28.88 (C qMe2, 25.79,26.35 (CHMe2, 42.64 (NCH, 43.11 (CHCH2, 51.59 (OMe, 54.32 (CqMe2, 69.52 (OCH, 174.39 (C=O, IR (NaCl, 3286, 1754 (OH, C=O) cm-1. MS (70 eV, m/z, no [M, 201 (15, 188 (33, M, Me, 186 (22, 171 (35, 170(15, 156(72, 144(11, 138(9, 128(24, 115 (13, 114 (38, 102 (12, 100 79, 99
-
+-Me], 186 (22), 171 (35), 170(15), 156(72), 144(11), 138(9), 128(24), 115 (13), 114 (38), 102 (12), 100 (79), 99 (10), 98 (17), 96 (15), 86 (22), 85 (24), 84 (60), 83 (16), 74 (12), 72 (11), 71 (51), 70 (16), 68 (17), 58 (54), 57 (20), 56 (21), 55 (24).
-
-
-
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53
-
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49649092950
-
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1-Isopropyl-3-methoxy-5,5-dimethylpiperidin-2-one (12, yield: 80, Rf0.40 (hexane-EtOAc, 3:2, 1HNMR (270 MHz, CDCl3, δ, 1.02, 1.05 (2 x s, 6 H, CqMe 2, 1.04, 1.06 (2 x d, J= 6.9 Hz, 6 H, Me2CH, 1.62 [dd, J= 7.0,13.0 Hz, 1 H, CqC#(H, 1.88 [dd, J= 8.0, 13.0Hz, 1 H, CqCH(H, 2.79 [d, J= 12.0 Hz, 1 H, NCH(H, 2.97 [d, J= 12.0 Hz, 1 H, NCH(H, 3.57 (s, 3 H, OMe, 3.87 (dd, J, 8.0. 13.0 Hz, 1 H, OCH, 4.87 (sept, J= 6.9 Hz, 1 H, CiMe2, 13C NMR (68 MHz, CDCl3, δ= 19.19, 19.43 (CHMe2, 26.04, 28.84 (CqMe2, 29.92 (CqCH2, 40.65 (CqCH2, 43.41 (CAMe2, 51.30 (NCH2, 58.85 (OMe, 75.96 (OCH, 169.13 (C=O, IR (NaCl, 1646 (C=O) cm-1. MS 70 eV, m/z, no [M
-
2: C, 66.29; H, 10.62; N, 7.03. Found: C, 66.13; H, 10.80; N, 6.88.
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Alcaide, B.; Almendros, P.; Cabrero, G.; Ruiz, M. P. J. Org. Chem. 2007, 72, 7980.
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J. Org. Chem
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, pp. 7980
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Alcaide, B.1
Almendros, P.2
Cabrero, G.3
Ruiz, M.P.4
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