Sodium Hydroxide → (+/-)-{4-[2,4-Bis(methoxymethoxy)phenyl]cyclohexylidene}acetic acid

Temperature

0 °C

To a round bottomed flask was added trimethylsilyldiethylphosphonoacetate (1.08 ml) and tetrahydrofuran (25 ml). The solution was cooled to 0° C. and n-butyl lithium (1.80 ml, 2.2M in cyclohexanes) was added dropwise and the reaction mixture allowed to warm to room temperature and stirred for 17 hr. 4-[(2,4-Bis(methoxymethoxy)phenyl)]cyclohexanone (750 mg) was added as a solution in tetrahydrofuran (25 ml). After 2 hr at room temperature, the mixture was poured into a separating funnel containing aqueous sodium hydroxide solution (10 ml, 10% w/v). After extracting with diethyl ether (10 ml), the aqueous layer was acidified by adding concentrated hydrochloric acid (10 ml), and extracted with diethyl ether (3×20 ml). The combined organic layers were washed with water (10 ml), dried over magnesium sulfate, filtered and concentrated in vacuo affording the title compound (422 mg, 52%) as an oil. δH(CDCl3) 1.86 (2H, m), 2.00-2.13 (4H, m), 2.42 (2H, m), 3.19 (1H, m), 3.48 (3H, s), 3.51 (3H, s), 5.14 (2H, s), 5.21 (2H, s), 5.71 (1H, s), 6.67 (1H, dd), 6.81 (1H, d), 7.05 (1H, d).

1. temperatureto warm to room temperature
2. waitAfter 2 hr at room temperature
3. additionthe mixture was poured into a separating funnel
4. extractionAfter extracting with diethyl ether (10 ml)
5. additionby adding concentrated hydrochloric acid (10 ml)
6. extractionextracted with diethyl ether (3×20 ml)
7. washThe combined organic layers were washed with water (10 ml)
8. dry with materialdried over magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD record

ord-4f630f3de2d440c5a5ad1c5e2cadf687

Source dataset

uspto-grants-2004_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06797731B2