Citric Acid → HCID 18427691, compound

Temperature

110 °C

To 463.0 g (21.7% wt/wt, 203.8 mmol) of a toluene solution of methyl-(1S,2R,3S)-3-(2-hydroxy-4-methoxyphenyl)-1-(3,4-methylenedioxyphenyl)-5-(prop-1-yloxy)indane-2-carboxylate was added 425 mL of toluene, 70 g (496 mmol) of potassium carbonate (325 mesh) and 183 (2.04 mol) of ethylene carbonate. The resulting mixture was heated to approximately 110° C. over a period of 60 minutes then held at this temperature. The progress of the reaction was monitored by HPLC. The reaction was considered complete when less than 1.0% PAR (peak area ratio) of starting material was detected. After approximately 3 hours at or around 110° C., the reaction was cooled to 70° C. and DI water (700 mL) was added. The mixture was stirred for 15 minutes then the aqueous layer was separated. The organic layer was washed with 5% aqueous citric acid solution (500 mL) followed by DI water (500 mL). The organic phase was separated then concentrated under reduced pressure to a viscous oil. The concentrate was diluted with methanol (300 mL) and tetrahydrofuran (500 mL) then a solution of lithium hydroxide monohydrate (28 g, 654 mmol) dissolved in 300 mL of deionized water was added. The resulting solution was heated to reflux (internal temperature 62-65° C.) over approximately 15 minutes and maintained at reflux while monitoring the reaction progress by HPLC. The reaction was considered complete when no intermediates were detected by in-process HPLC analysis. After approximately 12 hours at reflux the reaction was considered complete and the resulting mixture cooled to ambient temperature. DI water (500 mL) was added and the reaction mixture concentrated under reduced pressure to a volume of approximately 1 L. Toluene (760 mL) followed by citric acid (150 g, 833 mmol) was added to the resulting solution and the mixture stirred for 5 minutes. The bottom aqueous layer was drained and the organic layer was washed twice with aqueous brine solution (600 mL). The organic layer was separated and filtered to afford 868.8 g of (+)(1S,2R,3S)]-3-[2-(2-hydroxyeth-1-yloxy)-4-methoxyphenyl]-1-(3,4-methylendioxyphenyl)-5-propoxyindane-2-carboxylic acid as a solution in toluene. HPLC wt/wt assay indicated 11.2% wt/wt (+)(1S,2R,3S)]-3-[2-(2-hydroxyeth-1-yloxy)-4-methoxyphenyl]-1-(3,4-methylendioxyphenyl)-5-(prop-1-yloxy)indane-2-carboxylic acid.

1. temperaturethe reaction was cooled to 70° C.
2. customthe aqueous layer was separated
3. washThe organic layer was washed with 5% aqueous citric acid solution (500 mL)
4. customThe organic phase was separated
5. concentrationthen concentrated under reduced pressure to a viscous oil
6. additionThe concentrate was diluted with methanol (300 mL) and tetrahydrofuran (500 mL)
7. additionwas added
8. temperatureThe resulting solution was heated
9. temperatureto reflux (internal temperature 62-65° C.) over approximately 15 minutes
10. temperaturemaintained
11. temperatureat reflux
12. temperatureAfter approximately 12 hours at reflux the reaction
13. temperaturethe resulting mixture cooled to ambient temperature
14. concentrationthe reaction mixture concentrated under reduced pressure to a volume of approximately 1 L
15. additionwas added to the resulting solution
16. stirringthe mixture stirred for 5 minutes
17. washthe organic layer was washed twice with aqueous brine solution (600 mL)
18. customThe organic layer was separated
19. filtrationfiltered

ORD record

ord-f2888379b4dc443b9bcdcaac4510448a

Source dataset

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06441173B1