Lithium Hydroxide → HCID 1090984, compound

To a stirred solution of methyl ester 4 (32 mg, 0.15 mmol) in THE (2 mL) was added a solution of 1.0 M LiOH (2 mL) in one portion. The corresponding reaction was monitored by HPLC for consumption of the starting material. After 3 hours at room temperature, the reaction was complete. To the reaction was added EtOAc (2 mL) and water (2 mL) and the layers were allowed to separate. The aqueous layer was transferred to clean flask and then acidified to pH=1 using 2.0 N HCl. This was then extracted with EtOAc (5 mL) and the aqueous layer was discarded. The organic layer was washed with water (2 mL) and brine (2 mL) followed by drying over Na2SO4. Concentration gave 20 mg (65% yield) of the desired product 5 that was used “as is” in the next step.

1. customThe corresponding reaction
2. customwas monitored by HPLC for consumption of the starting material
3. additionTo the reaction was added EtOAc (2 mL) and water (2 mL)
4. customto separate
5. customThe aqueous layer was transferred to clean flask
6. extractionThis was then extracted with EtOAc (5 mL)
7. washThe organic layer was washed with water (2 mL) and brine (2 mL)
8. dry with materialby drying over Na2SO4
9. concentrationConcentration

ORD record

ord-74c59149315e445bbf057a2ce9fa4e3f

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08193225B2