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CAS No. : | 1080-32-6 | MDL No. : | MFCD00009078 |
Formula : | C11H17O3P | Boiling Point : | No data available |
Linear Structure Formula : | C6H5CH2P(O)(OCH2CH3)2 | InChI Key : | AIPRAPZUGUTQKX-UHFFFAOYSA-N |
M.W : | 228.22 | Pubchem ID : | 14122 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
37% | Intermediate 17(E)-2-Bromo-4-styrylpyridine. To a solution of diethyl benzylphosphonate (4.57 mL, 21.91 mmol) in dimethylformamide (50 mL) at room temperature was added sodium methoxide (2.367 g, 43.8 mmol) and 18-Crown-6 (2.316 g, 8.76 mmol). After stirring at room temperature for 5 min, the reaction was cooled to 0°C and treated with 2-bromoisonicotinaldehyde (4.89 g, 26.3 mmol) as a solid in one portion. The ice bath was removed and the reaction stirred at room temperature for 1 h. The reaction was gradually warmed to 120°C and held there for 2 h. The reaction was cooled to room temperature and poured into water (500 mL) with vigorous stirring. The resulting suspension was extracted with diethyl ether (3X), washed with water, then brine, dried over magnesium sulfate, and concentrated to an oil. The resulting residue was purified by column chromatography (6percent EtOAc/Hex- > 12percent EtO Ac/Hex) to give 2.12 g (37percent) as an oil. 3/4-NMR (CDCI3, 500 MHz) delta 8.35 (d, J=5.2, IH), 7.52-7.62 (m, 3H), 7.43 (m, 2H), 7.30-7.40 (m, 3H), 6.98 (d, J=16.2, IH) 13C-NMR (CDCI3, 126 MHz) delta 150.4, 147.7, 143.1, 135.8, 134.8, 129.3, 129.0, 127.3, 125.0, 124.6, 120.1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | General procedure: To a flame-dried 100 mL round-bottom flask NaHMDS (2 mmol, 1 eq) in THF (5 mL) were addedand the solution was cooled down to 0 C. A solution of the corresponding benzyl phosphonate(II) (2 mmol, 1 eq) in THF (12 mL) was added dropwise under stirring. The reaction was stirred fora further 10 min at 0 C, then a solution of the haloaldehyde (I) (2 mmol, 1 eq) in THF (4 mL) wasadded dropwise. The mixture was allowed to warm from 0 C to room temperature 12-14 h understirring. The reaction mixture was quenched with water (10 mL). The aq layer was extracted withEt2O (3 x 10 mL). The combined organic layers were washed with 10% aq NaHSO3 (2 x 5 mL)and then with brine (10 mL). The combined organic layers were dried over Na2SO4 andconcentrated by evaporation in vacuo to give 10a-c. (10a: E/Z: 10:1, 10b: E, 10c: E/Z: 20:1). TheE-isomers of compounds 10a?-c? was obtained using column chromatography (2.0% EtOAc inpetroleum ether) from mixtures of 10a-c. The E/Z ratio was determined by 1H NMR. |