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A Typical Experimental
Procedure for the Preparation of 5a
To a mixture of
ethyl 4,4,4-trifluoro-3-oxobutanoate (184.0 mg, 1.0 mmol) and 2-benzylidene-indane-1,3-dione
(468.0 mg, 2.0 mmol) in MeCN (3.0 mL) was added a catalytic amount
of pipreridine (8.5 mg, 0.1 mmol). The resulting mixture was stirred
at r.t. until the reaction was completed
(8 h, monitored
by TLC). The solvent was removed under reduced pressure. And then
the residue was purified by column chromatography on silica gel
using PE-EtOAc [6:1 (v/v)] as
eluent to afford 5a as a colorless solid
in 78% yield.
<A NAME="RW02209ST-16">16</A>
Spectroscopic
Data for Products 5
Compound 5a:
colorless solid (509.0 mg), mp 211-214 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.89
(t, J = 7.0
Hz, 3 H, OCH2CH
3),
3.84 (qd, J
1 = 7.0
Hz, J
2 = 3.5
Hz, 2 H, OCH
2CH3),
4.51 (d, J = 12.5
Hz, 1 H, CH), 4.56 (s, 1 H, CH), 5.19 (d, J = 12.5
Hz 1 H, CH), 5.65 (s, 1 H, OH), 6.37 (br, 1 H, ArH), 6.59-7.06
(m, 8 H, ArH), 7.32-7.42 (m, 4 H, ArH), 7.54-7.56
(m, 3 H ArH), 7.66-7.69 (m, 1 H, ArH), 7.93-7.95
(m, 1 H, ArH). ¹9F NMR (470 MHz, CDCl3): δ = -71.63
(s, 3 F, CF3). IR (KBr): 3402, 3062, 2981, 2932, 1745,
1711, 1594, 1247, 1184 cm-¹. ESI-MS: m/z = 653 [M + H]+,
670 [M + NH4]+.
Anal. Calcd for C38H27F3O7:
C, 69.94; H, 4.17. Found: C, 70.06; H, 4.06.
Compound 5b: colorless solid (510.0 mg), mp 227-229 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.91
(t, J = 7.0
Hz, 3 H, OCH2CH
3),
1.78 (s, 3 H, ArCH3), 2.04 (s, 3 H, ArCH3),
3.84 (qd, J
1 = 7.0
Hz, J
2 = 3.5
Hz, 2 H, OCH
2CH3),
4.47 (d, J = 12.5
Hz, 1 H, CH), 4.51 (s, 1 H, CH), 5.15 (d, J = 12.5 Hz,
1 H, CH), 5.63 (s, 1 H, OH), 6.15 (br, 1 H, ArH), 6.50-6.70
(m, 4 H, ArH), 6.82-6.86 (m, 2 H, ArH), 7.24-7.36
(m, 2 H, ArH), 7.39-7.43 (m, 2 H, ArH), 7.66-7.69
(m, 4 H, ArH), 7.92-7.93 (m, 1 H, ArH). ¹9F
NMR (470 MHz, CDCl3): δ = -71.65
(s, 3 F, CF3). IR (KBr): 3408, 3029, 2986, 1741, 1712,
1247 cm-¹. ESI-MS: m/z = 681 [M + H]+, 698 [M + NH4]+.
Anal. Calcd for C40H31F3O7:
C, 70.58; H, 4.59. Found: C, 70.33; H, 4.77.
Compound 5c: colorless solid (617.0 mg), mp 246-247 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.96 (t, J = 7.0 Hz,
3 H, OCH2CH
3),
3.89 (qd, J
1 = 7.0
Hz, J
2 = 3.5
Hz, 2 H, OCH
2CH3),
4.69 (d, J = 12.5
Hz, 1 H, CH), 4.71 (s, 1 H, CH), 5.20 (d, J = 12.5
Hz, 1 H, CH), 5.45 (s, 1 H, OH), 6.84-7.28 (m, 4 H, ArH),
7.43-7.53 (m, 3 H, ArH), 7.58-7.71 (m, 5 H, ArH),
7.76-7.80 (m, 2 H, ArH), 7.97-8.00 (m, 2 H, ArH). ¹9F
NMR (470 MHz, CDCl3): δ = -71.67
(s, 3 F, CF3). IR (KBr): 3420, 3058, 2979, 2934, 1746,
1710, 1595, 1248, 1188 cm-¹. ESI-MS:
743 [M + H]+, 760 [M + NH4]+.
HRMS (MALDI/DHB): m/z calcd
for [C38H25F3N2O11 + H]+: 743.1483;
found: 743.1501; m/z calcd for [C38H25F3N2O11 + Na]+:
765.1303; found:765.1309.
Compound 5d:
colorless solid (584.0 mg), mp 243-244 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.95
(t, J = 7.0
Hz, 3 H, OCH2CH
3),
3.87 (qd, J
1 = 7.0
Hz, J
2 = 3.5
Hz, 2 H, OCH
2CH3),
4.49 (d, J = 12.5
Hz, 1 H, CH), 4.53 (s, 1 H, CH), 5.11 (d, J = 12.5
Hz, 1 H, CH), 5.52 (s, 1 H, OH), 6.36-7.07 (m, 7 H, ArH),
7.33-7.51 (m, 4 H, ArH), 7.60-7.72 (m, 3 H, ArH),
7.72-7.75 (m, 1 H, ArH), 7.94-7.96 (m, 1 H, ArH). ¹9F
NMR (470 MHz, CDCl3): δ = -71.70
(s, 3 F, CF3). IR (KBr): 3408, 3071, 2986, 2937, 1739,
1713, 1593, 1243, 1196 cm-¹. ESI-MS: m/z = 721, 723, 725 [M + H]+,
738, 740, 742 [M + NH4]+.
Anal. Calcd for C38H25Cl2F3O7:
C, 63.26; H, 3.49. Found: C, 62.87; H, 3.58.
Compound 5e: colorless solid (551.0 mg), mp 222-223 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.92 (t, J = 7.0 Hz,
3 H, OCH2CH
3),
3.86 (qd, J
1 = 7.0
Hz, J
2 = 3.5
Hz, 2 H, OCH
2CH3),
4.49 (d, J = 12.5
Hz, 1 H, CH), 4.54 (s, 1 H, CH), 5.11 (d, J = 12.5
Hz, 1 H, CH ), 5.55 (s, 1 H, OH), 6.09 (br, 1 H, ArH) 6.49-6.93
(m, 6 H, ArH), 7.37-7.49 (m, 4 H, ArH), 7.56-7.60
(m, 3 H, ArH), 7.70-7.73 (m, 1 H, ArH), 7.93-7.95
(m, 1 H, ArH). ¹9F NMR (470 MHz, CDCl3): δ = -71.71
(s, 3 F, CF3), -112.61 (m, 1 F, ArF), -114.13
(m, 1 F, ArF). IR (KBr): 3397, 3087, 2983, 2938, 1743, 1711, 1511,
1247, 1190 cm-¹. ESI-MS: m/z = 689 [M + H]+.
Anal. Calcd for C38H25F5O7:
C, 66.28; H, 3.66. Found: C, 66.04; H, 3.49.
Compound 5f: colorless solid (620.0 mg), mp 241-243 ˚C. ¹H
NMR (500 MHz, CDCl3): δ = 0.94 (br,
3 H, OCH2CH
3), 3.87
(br, 2 H, OCH
2CH3),
4.51 (br, 2 H, CH), 5.13 (br, 1 H, CH), 5.58 (s, 1 H, OH), 6.34-7.01
(m, 7 H, ArH), 7.43-8.00 (m, 9 H, ArH). ¹9F
NMR (470 MHz, CDCl3): δ = -71.63
(s, 3 F, CF3). IR (KBr): 3440, 3055, 2984, 1744, 1710,
1593, 1249, 1235, 1176 cm-¹. ESI-MS: m/z = 721, 723, 725 [M + H]+,
738, 740, 742 [M + NH4]+.
Anal. Calcd for C38H25Cl2F3O7:
C, 63.26; H, 3.49. Found: C, 62.91; H, 3.37.
Compound 5g: colorless solid (743 mg), mp 265-266 ˚C. ¹H NMR
(500 MHz, CDCl3): δ = 0.95 (br, 3 H,
OCH2CH
3), 3.88 (br,
2 H, OCH
2CH3),
4.48 (br, 2 H, CH), 5.13 (br, 1 H, CH), 5.58 (s, 1 H, OH), 6.61-7.13
(m, 7 H, ArH), 7.35-7.76 (m, 8 H, ArH), 7.95-8.02
(m, 1 H, ArH). ¹9F NMR (470 MHz, CDCl3): δ = -71.61
(s, 3 F, CF3). IR (KBr): 3441, 3072, 2983, 1744, 1711,
1592, 1250, 1178 cm-¹. ESI-MS: m/z = 809, 811, 813 [M + H]+,
826, 828, 830 [M + NH4]+.
HRMS (MALDI/DHB): m/z calcd
for [C38H25Br2F3O7 + Na]+: 830.9811;
found: 830.9817.
<A NAME="RW02209ST-17">17</A>
In particular, in the cases of compounds 5f and 5g, the ¹H NMR
spectrum showed broad signals due to decreased rotational flexibility
of the highly puckered structures.
<A NAME="RW02209ST-18">18</A>
CCDC 720376 contains the supplementary
crystallographic data for this paper. These data can be obtained
free of charge via www.ccdc.cam.ac.uk/data_request/cif,
or by emailing data_request@ccdc.cam.ac.uk, or
by contacting The Cambridge Crystallographic Data Centre, 12 Union
Road, Cambridge CB2 1EZ, UK; fax: +44 (1223)336033.