Cesium carbonate → HCID 86642121, compound

To a stirred solution of 4-[N-(tert-butoxycarbonyl)amino]phenol (5.0 g, 23.89 mmol) in DMF (140 mL) was added cesium carbonate (19.5 g, 59.73 mmol). The reaction mixture was stirred at r.t. for 20 minutes, and then cyclopropylmethyl bromide (2.3 mL, 23.89 mmol) was added. The reaction mixture was stirred at r.t. for 2 days, cooled to r.t., filtered and partitioned between Et2O (2×25 mL) and water (100 mL). The layers were separated, and the aqueous fraction was further extracted with Et2O (3×50 mL). The combined organic fractions were washed with water (3×150 mL), dried (Na2SO4), filtered and concentrated in vacuo to give the title compound (5.1 g, 81%) as a light pink solid that was used without further purification. δH (DMSO-d6) 8.82 (1H, br. s), 7.09-7.06 (2H, m), 6.59-6.54 (2H, m), 3.50 (2H, d, J 6.9 Hz), 1.22 (9H, s), 0.97-0.90 (1H, m), 0.34-0.28 (2H, m), 0.08-0.03 (2H, m). LCMS (ES+) 207.0 ((M−tBu)+H)+, RT 3.20 minutes (Method 3).

1. stirringThe reaction mixture was stirred at r.t. for 2 days
2. temperaturecooled to r.t.
3. filtrationfiltered
4. custompartitioned between Et2O (2×25 mL) and water (100 mL)
5. customThe layers were separated
6. extractionthe aqueous fraction was further extracted with Et2O (3×50 mL)
7. washThe combined organic fractions were washed with water (3×150 mL)
8. dry with materialdried (Na2SO4)
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD record

ord-c412ec96bcc143b4b25e1475442eca91

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08242116B2