Molecules 2013, 18
5679
(2H, m, H-2 and H-3a); 3.82 (3H, s, OCH3); 6.98 (2H, d, J = 8.4 Hz, H-2';6'); 7.19 (2H, d, J = 8.5 Hz,
H-3';5') ppm. 13C-NMR (CDCl3): 16.9; 34.8; 36.6; 55.5; 114.5; 124.6; 127.6; 159.5;175.7; 179.8 ppm.
MS: m/z 219 (M+, 100%), 220 (M++1, 13%). [α]D27 +4.2 ± 1.1 (c 0.96, CHCl3)
(3R)-(+)-Methyl-N-(4'-nitrophenyl)succinimide (5. White solid. Mp: 111–112 °C. Yield: 72%. 1H-NMR
(CDCl3): 1.46 (3H, d, J = 7.2 Hz, CH3); 2.56 (1H, dd, J = 17.1; 3.9 Hz, H-3b); 2.98–3.18 (2H, m, H-2;
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3a); 7.61 (2H, d, J = 9.3 Hz, H-2',6'); 8.34 (2H, d, J = 9.4 Hz, H-3',5') ppm. C-NMR (CDCl3): 16.9;
34.9; 36.6; 123.1; 124.4; 126.8; 137.5; 174.5; 178.6; ppm. MS: m/z 234 (M+, 100%), 235 (M++1,
12%). [α]2D7 +6.1 ± 0.9 (c 0.86, CHCl3)
(3R)-(+)-Methyl-N-(4'-fluorophenyl)succinimide (6). White solid. Mp: 105–107 °C. Yield: 76%. 1H-NMR
(CDCl3): 1.45 (3H, d, J = 7.2 Hz, CH3); 2.50 (1H, dd, 17.1; 3.8 Hz, H-3b); 2.98–3.19 (2H, m, H-2 and
H-3a); 7.15 (2H, t, J = 8.7 Hz, H-2',6'); 7.28 (2H, dd, J = 8.0, 5.8 Hz, H-3',5') ppm. 13C-NMR (CDCl3):
16.9; 34.8; 36.6; 116.2 (d, JC-F = 22.9 Hz); 128.2 (d, JC-F = 8.8 Hz); 148.5; 162.3 (d, JC-F = 248.7 Hz);
175.3; 179.4 ppm. MS: m/z 207 (M+, 100%), 250 (M++1, 12%). [α]D27 +4.9 ± 0.8 (c 0.72, CHCl3).
(3R)-(+)-Methyl-N-(4'-chlorophenyl)succinimide (7). White solid. Mp: 112–113 °C. Yield: 68%. 1H-NMR
(CDCl3): 1.46 (3H, d, J = 7.2 Hz, CH3); 2.51 (1H, dd, J = 17.1; 3.8 Hz, H-3b); 2.96–3.16 (2H, m, H-2
and H-3a); 7.26 (2H, d, J = 8.8 Hz, H-3',5'); 7.44 (2H, d, J = 8.7 Hz, H-2',6') ppm. 13C-NMR (CDCl3):
16.9; 34.8; 36.6; 126.2; 129.1; 136.4; 142.3; 178.4; 178.7 ppm. MS: m/z 223 (M+, 100%), 225 (M++2,
32%), 224 (M++1, 12%). [α]D27 +4.5 ± 1.1 (c 0.66, CHCl3). [α]D27 +4.5 ± 1.1 (c 0.66, CHCl3).
(3R)-(+)-Methyl-N-(4'-bromophenyl)succinimide (8). White solid. Mp: 134–136 °C. Yield: 49%. 1H-NMR
(CDCl3): 1.46 (3H, d, J = 7.2 Hz, CH3); 2.51 (1H, dd, 17.1; 3.8 Hz, H-3b); 2.96–3.16 (2H, m, H-2 and
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H-3a); 7.19 (2H, d, J = 8.8 Hz, H-3',5'); 7.56 (2H, d, J = 8.7 Hz, H-2',6') ppm. C-NMR (CDCl3):
16.8; 34.9; 36.6; 122.4; 127.9;130.9;132.3; 174.8; 179.2 ppm. MS: m/z 267 (M+, 100%), 269 (M++2,
98%), 268 (M++1, 12%). [α]D27 +5.6 ± 1.3 (c 0.58, CHCl3).
(3R)-(+)-Methyl-(2'-methylphenyl)succinimide (9). White solid. Mp: 102–105 °C. Yield: 74%. 1H-NMR
(CDCl3): 1.46 (3H, dd, J = 7.15, 1.46 Hz, CH3); 2.13 (3H, d, J = 1.87 Hz, CH3); 2.52 (1H, ddd,
J = 16.7, 3.4, 1.6 Hz, H-3b); 2.96–3.17 (2H, m, H- 2;3a); 7.05 (1H, dd, J = 7.2, 1.1 Hz; H-4');
7.24–7.38 (3H, m, H-3';5';6') ppm. 13C-NMR (CDCl3): 16.9; 17.5; 35.2; 36.8; 126.9; 127.9; 129.5;
131.0; 131.2; 135.5; 175.4; i179.6 ppm. MS: m/z 201 (M+, 100%), 202 (M++1, 13%). [α]D27 +7.3 ± 1.7
(c 0.47, CHCl3)
(3R)-(+)-Methyl-N-(2',4'-difluorophenyl)succinimide (10). White solid. Mp: 102–104 °C. Yield: 49%.
1H-NMR (CDCl3): 1.45 (3H, dd, J = 7.15, 1.46 Hz, CH3); 2.52 (1H, dd, J = 3.4, 1.6 Hz, H-3b);
2.95–3.16 (2H, m, H-2;3a); 6.79 (2H, q, J = 9.3 Hz; 5',6'-H); 7.15 (1H, dt, J = 8.6 Hz; 3'-H) ppm. 13C-NMR
(CDCl3): 16.8; 35.2; 36.7; 105.3 (dd, J = 26.4, 23.5 Hz), 112.0 (dd, J = 22.6, 3.6 Hz), 116.08 (dd,
J = 13.4, 3.9 Hz), 130.24 (dd, J = 10.2, 1.7 Hz), 157.7 (dd, J = 255.1, 12.8 Hz), 163.1 (dd, J = 251.9,
11.4 Hz), 168.7; 169.2 ppm. MS: m/z 225 (M+, 100%), 226 (M++1, 12%). [α]D27 +5.3 ± 1.4 (c 0.81, CHCl3).