Water → HCID 67348174, Verbindung

Temperatur

50 °C

To 3-hydroxy-azetidine-1-carboxylic acid tert-butyl ester (0.35 g, 2.0 mmol) in NMP (3 mL) was added 60% NaH in mineral oil (0.08 g, 2.0 mmol). After 20 min at rt, the reaction was heated to 50° C. for 20 min, cooled to rt and the title compound from step A (0.40 g, 1.7 mmol) in NMP (1 mL) was added. The reaction was then heated in a microwave reactor at 145° C. for 1 h, cooled to rt, poured into H2O and extracted with EtOAc (2×). The combined organics were washed with brine and dried. Silica gel chromatography (2-15% EtOAc in hexanes) gave 0.34 g (51% yield) of the title compound as a white solid. 1H NMR (CDCl3): 7.74 (d, J=2.1 Hz, 1H), 7.46 (d, J=7.0 Hz, 2H), 7.39-7.30 (m, 3H), 6.77 (d, J=2.1 Hz, 1H), 5.42 (s, 2H), 4.87-4.82 (m, 1H), 4.26 (dd, J=10.5, 6.4 Hz, 2H), 4.05 (dd, J=10.3, 4.2 Hz, 2H), 1.44 (s, 9H).

1. temperaturecooled to rt
2. temperatureThe reaction was then heated in a microwave reactor at 145° C. for 1 h
3. temperaturecooled to rt
4. extractionextracted with EtOAc (2×)
5. washThe combined organics were washed with brine
6. customdried

ORD-Eintrag

ord-6da65b88fe29479bbd83510646050790

Quelldatensatz

uspto-grants-2014_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08642583B2