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General Procedure
for the Preparation of Compounds 4a-i:
A mixture of N-isocyaniminotriphenylphosphorane
(1 mmol), the appropriate imine (1 mmol) and Meldrum’s
acid (1 mmol) in THF (5 mL) was stirred at ambient temperature for
48 h. The progress of the reaction was monitored by TLC. Then, the
solvent was removed under the reduced pressure and the residue was
purified by column chromatography using n-hexane-EtOAc
(3:1) as eluent. The solvent was removed and the product was recrystallized from n-hexane-EtOAc (1:1).
1-Amino-4-(4-methylphenyl)-2,5-dioxo-
N
³
-phenyl-3-pyrrolidinecarboxamide (4c):
yield: 0.28 g (86%);
colorless crystal; mp 152-154 ˚C. IR (KBr): 3340,
3275, 3192 (NH), 1772, 1693 (C=O), 1600, 1534, 1438, 1312,
1191, 1106, 903, 815, 748, 691 cm-¹. ¹H NMR
(500.1 MHz, DMSO-d
6): δ = 2.28
(s, 3 H, Me), 4.01 (d, J = 5.0
Hz, 1 H, CH), 4.34 (d, J = 5.0
Hz, 1 H, CH), 5.16 (br s, 2 H, NH2), 7.09 (t, J = 7.4 Hz, 1 H, CH), 7.17-7.21
(m, 4 H, 4 × CH), 7.33 (dd, J = 8.1,
7.7 Hz, 2 H, 2 × CH), 7.59 (d, J = 7.7
Hz, 2 H, 2 × CH), 10.49 (s, 1 H, NHCO). ¹³C
NMR (125.8 MHz, DMSO-d
6): δ = 20.53
(Me), 47.26, 54.72 (2 × CH), 119.19, 123.97, 127.95, 128.79,
129.30 (5 × CH), 133.41, 137.02, 138.21 (3 × C),
164.82, 171.06, 174.59 (3 × C=O). EI-MS: m/z (%) = 323
(10) [M+], 279 (13), 236 (9), 203
(21), 167 (31), 149 (86), 115 (17), 97 (23), 83 (37), 71 (42), 69
(78), 57 (89), 55 (65), 43 (100), 41 (72). Anal. Calcd for C18H17N3O3 (323.35):
C, 66.86; H, 5.30; N, 13.00. Found: C, 67.0; H, 5.4; N, 12.8.
1-Amino-4-(4-chlorophenyl)-2,5-dioxo-
N
³
-phenyl-3-pyrrolidinecarboxamide (4e): yield: 0.33 g (96%); colorless
crystal; mp 172-174 ˚C. IR (KBr): 3321, 3234, 3172
(NH), 1787, 1704, 1667 (C=O), 1603, 1537, 1493, 1440, 1414,
1321, 1257, 1215, 1094, 1051, 1007, 965, 830, 790, 743, 693, 658
cm-¹. ¹H NMR (500.1
MHz, DMSO-d
6): δ = 4.04
(d, J = 5.3 Hz, 1 H, CH), 4.45
(d, J = 5.3 Hz, 1 H, CH), 5.15
(s, 2 H, NH2), 7.09 (t, J = 7.4
Hz, 1 H, CH), 7.33 (dd, J = 8.1,
7.7 Hz, 2 H, 2 × CH), 7.38 (d, J = 8.5
Hz, 2 H, 2 × CH), 7.45 (d, J = 8.5
Hz, 2 H, 2 × CH), 7.59 (d, J = 7.7 Hz,
2 H, 2 × CH), 10.50 (s, 1 H, NHCO). ¹³C
NMR (125.8 MHz, DMSO-d
6): δ = 46.93,
54.39 (2 × CH), 119.30, 124.09, 128.76, 128.89, 130.25
(5 × CH), 132.56, 135.34, 138.27 (3 × C), 164.75,
171.00, 174.27 (3 × C=O). EI-MS: m/z (%) = 345
(13) [M+ + ³7Cl],
343 (35) [M+ + ³5Cl],
315 (31), 295 (11), 284 (7), 273 (17), 236 (15), 223 (53), 207 (32),
196 (29), 179 (24), 165 (48), 152 (17), 137 (33), 111 (22), 102
(33), 93 (47), 83 (43), 77 (45), 69 (80), 57 (100), 43 (98), 41
(84). Anal. Calcd for C17H14ClN3O3 (343.77):
C, 59.40; H, 4.10; N, 12.22. Found: C, 59.4; H, 4.0; N, 12.1.
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