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Volumn , Issue 11, 2009, Pages 1842-1846

Unexpected formation of fluorine-containing multiply substituted dispirocyclohexanes from the reaction of ethyl-4,4,4-trifluoro-1,3- dioxobutanoate and 2-arylideneindane-1,3-diones

Author keywords

2 arylidene indan 1,3 dione; Ethyl 4,4,4 trifluoro 3 oxobutanoate; Fluorine containing; Polysubstitution; Spiro compound

Indexed keywords

1,3 INDANDIONE DERIVATIVE; 2 ARYLIDENEINDANE 1,3 DIONE DERIVATIVE; BUTYRIC ACID; CYCLOHEXANE DERIVATIVE; DISPIROCYCLOHEXANE DERIVATIVE; ETHYL 4,4,4 TRIFLUORO 1,3 DIOXOBUTANOATE; FLUORINE; PIPERIDINE; UNCLASSIFIED DRUG;

EID: 67650146390     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0029-1217361     Document Type: Article
Times cited : (36)

References (64)
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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 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.
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    • Spectroscopic Data for Products 5 Compound 5a: colorless solid (509.0 mg, mp 211-214°C. 1H NMR (500 MHz, CDCl 3, δ, 0.89 (t, J, 7.0 Hz, 3 H, OCH 2CH3, 3.84 (qd, J1, 7.0 Hz, J2, 3.5 Hz, 2 H, OCH2CH3, 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 C 38H27F3O7: C, 69.94; H, 4.17. Found: C, 70.06; H, 4.06. Compound
    • 3)
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    • 1H NMR spectrum showed broad signals due to decreased rotational flexibility of the highly puckered structures.
    • 1H NMR spectrum showed broad signals due to decreased rotational flexibility of the highly puckered structures.
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    • 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.
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.