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4.3.2. (E)-3-(1,3-Dithian-2-ylidene)-6-(4-methoxyphe-
nyl)hex-5-ene-2,4-dione (3ab). Yellowish solid, mp 119–
121 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.21 (s, 3H),
2.19–2.27 (m, 2H), 2.92 (m, 4H), 3.84 (s, 3H), 6.75 (d,
1H, J¼16 Hz), 6.91 (d, 2H, J¼8 Hz), 7.48 (d, 1H,
J¼16 Hz), 7.50 (d, 2H, J¼8 Hz). 13C NMR (CDCl3,
125 MHz): d¼24.4, 29.1, 29.7, 29.8, 55.7, 114.8, 125.2,
127.2, 130.7, 135.8, 145.7, 162.2, 164.7, 193.3, 193.5. IR
(KBr, cmꢁ1): 3420, 2936, 1630, 1602, 1570, 1511, 1472,
1420, 1250, 1174, 1021. Anal. Calcd for C17H18O3S2: C,
61.05; H, 5.42. Found: C, 60.95; H, 5.45.
d¼29.8, 37.1, 38.0, 126.5, 128.6, 129.2, 131.1, 134.7,
144.1, 145.1, 173.8, 191.8, 193.7. IR (KBr, cmꢁ1): 3425,
3058, 2922, 1629, 1583, 1572, 1448, 1407, 1331, 1283,
1245, 1178, 982. Anal. Calcd for C15H14O2S2: C, 62.04;
H, 4.86. Found: C, 61.93; H, 4.85.
4.3.8. (E)-3-(1,3-Dithian-2-ylidene)-6-phenylhex-5-ene-
2,4-dione (3bd). Yellowish solid, mp 116–118 ꢀC. 1H
NMR (CDCl3, 500 MHz): d¼2.23 (s, 3H), 2.25–2.29 (m,
2H), 2.94 (m, 4H), 6.89 (d, 1H, J¼16 Hz), 7.40–7.42 (m,
3H), 7.53 (d, 1H, J¼16 Hz), 7.56 (m, 2H). 13C NMR
(CDCl3, 125 MHz): d¼24.5, 29.2, 29.7, 29.9, 127.4, 128.8,
129.3, 131.2, 134.6, 135.8, 145.5, 165.5, 193.2, 193.3. IR
(KBr, cmꢁ1): 1640, 1625, 1571, 1452, 1422, 1325, 1242,
1159, 977, 740. Anal. Calcd for C16H16O2S2: C, 63.13;
H, 5.30. Found: C, 63.33; H, 5.31.
4.3.3. (E)-3-(1,3-Dithiolan-2-ylidene)-6-p-tolylhex-5-ene-
2,4-dione (3ba). Yellowish solid, mp 156–158 ꢀC. 1H
NMR (CDCl3, 500 MHz): d¼2.33 (s, 3H), 2.39 (s, 3H),
3.33–3.39 (m, 4H), 6.90 (d, 1H, J¼16 Hz), 7.22 (d, 2H,
J¼8 Hz), 7.46 (d, 2H, J¼8 Hz), 7.56 (d, 1H, J¼16 Hz).
13C NMR (CDCl3, 125 MHz): d¼21.8, 29.8, 37.0, 38.0,
125.6, 127.9, 128.8, 130.0, 131.9, 141.8, 145.4, 172.9,
192.1, 193.7. IR (KBr, cmꢁ1): 1626, 1582, 1565, 1418,
1323, 1245, 1178, 811. Anal. Calcd for C16H16O2S2: C,
63.13; H, 5.30. Found: C, 63.29; H, 5.34.
4.3.9. (5E,7E)-3-(1,3-Dithiolan-2-ylidene)-8-phenylocta-
5,7-diene-2,4-dione (3ae). Yellowish solid, mp 118–
120 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.32 (s, 3H),
3.34–3.38 (m, 4H), 6.49 (d, 1H, J¼16 Hz), 6.96 (d, 1H, J¼
8 Hz), 6.98 (s, 1H), 7.37–7.39 (m, 4H), 7.49 (d, 2H, J¼
8 Hz). 13C NMR (CDCl3, 125 MHz): d¼29.8, 37.1, 38.0,
126.8, 127.7, 127.9, 129.1, 129.7, 129.8, 136.1, 142.6,
145.4, 173.1, 191.9, 193.8. IR (KBr, cmꢁ1): 3446, 1716,
1683, 1615, 1509, 1393, 1282, 1251, 1217, 1002. Anal. Calcd
for C17H16O2S2: C, 64.53; H, 5.10. Found: C, 64.54; H, 5.13.
4.3.4. (E)-3-(1,3-Dithian-2-ylidene)-6-p-tolylhex-5-ene-
2,4-dione (3bb). Yellowish solid, mp 138–140 ꢀC. 1H
NMR (CDCl3, 500 MHz): d¼2.21 (s, 3H), 2.22–2.26 (m,
2H), 2.38 (s, 3H), 2.92–2.96 (m, 4H), 6.84 (d, 1H, J¼
16 Hz), 7.21 (d, 2H, J¼8 Hz), 7.46 (d, 2H, J¼8 Hz), 7.50
(d, 1H, J¼16 Hz). 13C NMR (CDCl3, 125 MHz): d¼21.4,
24.1, 28.8, 29.3, 29.5, 126.2, 128.5, 129.7, 131.6, 135.5,
141.5, 145.4, 192.9. IR (KBr, cmꢁ1): 3420, 2925, 1638,
1587, 1564, 1455, 1421, 1322, 1244, 1158, 980. Anal. Calcd
for C17H18O2S2: C, 64.12; H, 5.70. Found: C, 64.32; H, 5.74.
4.3.10. (5E,7E)-3-(1,3-Dithian-2-ylidene)-8-phenylocta-
5,7-diene-2,4-dione (3be). Yellowish solid, mp 109–
110 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.21 (s, 3H),
2.22–2.26 (m, 2H), 2.93 (m, 4H), 6.41 (d, 1H, J¼16 Hz),
6.95 (d, 2H, J¼8 Hz), 7.33–7.35 (m, 4H), 7.48 (d, 2H,
J¼8 Hz). 13C NMR (CDCl3, 125 MHz): d¼24.4, 29.1,
29.7, 29.9, 126.8, 127.7, 129.1, 129.7, 130.6, 135.8, 136.1,
142.6, 145.7, 165.0, 193.1, 193.4. IR (KBr, cmꢁ1): 1632,
1617, 1476. Anal. Calcd for C18H18O2S2: C, 65.42; H,
5.49. Found: C, 65.53; H, 5.51.
4.3.5. (E)-6-(Benzo[d][1,3]dioxol-5-yl)-3-(1,3-dithiolan-2-
ylidene)hex-5-ene-2,4-dione (3ac). Yellowish solid, mp
130–132 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.32 (s, 3H),
3.34–3.38 (m, 4H), 6.03 (s, 2H), 6.77 (d, 1H, J¼16 Hz),
6.83 (d, 1H, J¼8 Hz), 7.05 (d, 1H, J¼8 Hz), 7.07 (s, 1H),
7.50 (d, 1H, J¼16 Hz) .13C NMR (CDCl3, 125 MHz): d¼
29.3, 36.7, 37.7, 101.6, 106.6, 108.6, 124.3, 125.3, 127.7,
128.8, 144.8, 148.4, 150.1, 172.4, 191.6, 193.3. IR (KBr,
cmꢁ1): 3853, 3734, 1576, 1558, 1500, 1489, 1257, 1226,
1034. Anal. Calcd for C16H14O4S2: C, 57.47; H, 4.22.
Found: C, 57.59; H, 4.26.
4.3.11. (E)-6-(4-Chlorophenyl)-3-(1,3-dithiolan-2-ylidene)-
hex-5-ene-2,4-dione (3af). Yellowish solid, mp 152–154 ꢀC.
1H NMR (CDCl3, 500 MHz): d¼2.33 (s, 3H), 3.37–3.39 (m,
4H), 6.92 (d, 1H, J¼16 Hz), 7.38 (d, 2H, J¼8 Hz), 7.49 (d,
2H, J¼8 Hz), 7.54 (d, 1H, J¼16 Hz). 13C NMR (CDCl3,
125 MHz): d¼29.9, 37.1, 38.0, 126.9, 128.0, 129.6, 129.9,
133.2, 137.0, 143.4, 174.1, 191.2, 193.8. IR (KBr, cmꢁ1):
1623, 1572, 1490, 1405, 1379, 1182, 1087. Anal. Calcd for
C15H13ClO2S2: C, 55.46; H, 4.03. Found: C, 55.62; H, 4.14.
4.3.6. (E)-6-(Benzo[d][1,3]dioxol-5-yl)-3-(1,3-dithian-
2-ylidene)hex-5-ene-2,4-dione (3bc). Yellowish solid, mp
141–143 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.20 (s, 3H),
2.21–2.25 (m, 2H), 2.91–2.95 (m, 4H), 6.02 (s, 2H), 6.69
(d, 1H, J¼16 Hz), 6.82 (d, 1H, J¼8 Hz), 7.02 (d, 1H,
J¼8 Hz), 7.06 (s, 1H), 7.43 (d, 1H, J¼16 Hz). 13C NMR
(CDCl3, 125 MHz): d¼24.1, 28.8, 29.4, 29.5, 101.6, 106.6,
108.6, 125.2, 125.4, 128.7, 135.6, 145.1, 148.4, 150.1,
164.6, 192.7, 193.0. IR (KBr, cmꢁ1): 3446, 1623, 1502,
1480, 1449, 1358, 1253, 1214, 1034, 976. Anal. Calcd for
C17H16O4S2: C, 58.60; H, 4.63. Found: C, 58.63; H, 4.61.
4.3.12. (E)-6-(4-Chlorophenyl)-3-(1,3-dithian-2-ylidene)-
hex-5-ene-2,4-dione (3bf). Yellowish solid, mp 135–137 ꢀC.
1H NMR (CDCl3, 500 MHz): d¼2.22 (s, 3H), 2.26–2.30
(m, 2H), 2.93–2.95 (m, 4H), 6.84 (d, 1H, J¼16 Hz), 7.37 (d,
2H, J¼8 Hz), 7.47 (d, 2H, J¼8 Hz), 7.49 (d, 1H, J¼16 Hz).
13C NMR (CDCl3, 125 MHz): d¼24.1, 28.9, 29.3, 29.6,
127.3, 129.2, 129.5, 132.8, 135.5, 136.7, 143.3, 165.2, 191.9,
193.2. IR (KBr, cmꢁ1): 1652, 1643, 1587, 1458, 1402, 1243,
1160, 1090. Anal. Calcd for C16H15ClO2S2: C, 56.71;
H, 4.46. Found: C, 56.54; H, 4.50.
4.3.7. (E)-3-(1,3-Dithiolan-2-ylidene)-6-phenylhex-5-ene-
2,4-dione (3ad). Yellowish solid, mp 108–110 ꢀC. 1H NMR
(CDCl3, 500 MHz): d¼2.33 (s, 3H), 3.33–3.39 (m, 4H), 6.95
(d, 1H, J¼16 Hz), 7.39–7.41 (m, 3H), 7.50 (d, 2H, J¼8 Hz),
7.58 (d, 1H, J¼16 Hz). 13C NMR (CDCl3, 125 MHz):
4.3.13. (E)-6-(4-(Dimethylamino)phenyl)-3-(1,3-dithio-
lan-2-ylidene)hex-5-ene-2,4-dione (3ag). Yellowish solid,
mp 172–174 ꢀC. 1H NMR (CDCl3, 500 MHz): d¼2.30