Hydrochloric Acid → HCID 178442793, compound

Temperature

45 °C

17.4 g (0.10M) of 2-hydroxy-1,4-naphthoquinone was dissolved in 120 ml of DMSO, and 0.88 g (0.11M) of LiH was gradually added thereto. Here, this should be done with care because hydrogen evolves. The reaction solution was stirred, and after confirming no further production of hydrogen, was additionally stirred for another 30 min. Then, 21.8 g (0.10M) of geranyl bromide and 3.35 g (0.025M) of LiI were gradually added thereto. The reaction solution was heated to 45° C. and then vigorously stirred for 12 hours at that temperature. The reaction solution was cooled below 10° C., and 80 g of ice was first added and 250 ml of water was then added. Thereafter, 25 ml of concentrated HCl was gradually added to maintain the resulting solution at an acidic pH>1. 200 ml of CH2Cl2 was added to dissolve the reaction mixture which was then shaken vigorously to separate two layers. The aqueous layer was discarded, and a CH2Cl2 layer was treated with an aqueous 2N NaOH solution (100 ml×2) to separate the aqueous layer twice. The thus-separated aqueous solutions were combined and adjusted to an acidic pH>2 using concentrated HCl, thereby forming solids. The resulting solids were filtered and separated to give 2-geranyl-3-hydroxy-1,4-naphthoquinone. The thus-obtained product was mixed with 50 ml of sulfuric acid without further purification, and the mixture was vigorously stirred at room temperature for 10 min, followed by addition of 150 g of ice to complete the reaction. 60 ml of CH2Cl2 was added to the reaction materials which were then shaken vigorously. Thereafter, a CH2Cl2 layer was separated and washed with 5% NaHCO3. An aqueous layer was extracted once again using 30 ml of CH2Cl2, washed with 5% NaHCO3 and combined with the previously extracted organic layer. The organic layer was concentrated and purified by chromatography on silica gel to give 3.62 g of pure Compound 20.

1. stirringwas additionally stirred for another 30 min
2. stirringvigorously stirred for 12 hours at that temperature
3. temperatureThe reaction solution was cooled below 10° C.
4. temperatureto maintain the resulting solution at an acidic pH>1
5. dissolutionto dissolve the reaction mixture which
6. stirringwas then shaken vigorously
7. customto separate two layers
8. additiona CH2Cl2 layer was treated with an aqueous 2N NaOH solution (100 ml×2)
9. customto separate the aqueous layer twice
10. customforming solids
11. filtrationThe resulting solids were filtered
12. customseparated

ORD record

ord-5bc61fed66324fc5930d89b94a70c5dc

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09066922B2