Potassium Carbonate → Methyl (4-((1E,4S)-4-((tert-butoxycarbonyl)amino)-3-oxohepta-1,6-dien-1-yl)-3-nitrophenyl)carbamate

To a vigorously stirred solution of 5E (4.47 g, 13.92 mmol) and 5D (2.6 g, 11.60 mmol) in THF (anhydrous) (115 mL) and EtOH (absolute) (1.148 mL) under nitrogen was added portion wise K2CO3 (anhydrous) (2.56 g, 18.56 mmol) at 0° C. The reaction mixture was allowed to raise to rt and then the mixture was heated at 55° C. The reaction mixture was then filtered with the aid of EtOAc and the filtrate evaporated to a residue which was dissolved in a small amount of methylene chloride and purified by normal phase chromatography to give 5F (4.38 g, 90%) as yellow solid. MS (ESI) m/z: 420.2 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 10.36 (s, 1H), 8.22 (d, J=2.2 Hz, 1H), 7.89 (d, J=8.8 Hz, 1H), 7.83-7.73 (m, 2H), 7.21 (d, J=7.7 Hz, 1H), 7.02 (d, J=15.9 Hz, 1H), 5.77 (ddt, J=17.0, 10.2, 6.7 Hz, 1H), 5.16-5.01 (m, 2H), 4.32 (td, J=8.5, 4.9 Hz, 1H), 3.71 (s, 3H), 2.34-2.23 (m, 1H), 1.36 (s, 9H) ppm.

1. temperaturethe mixture was heated at 55° C
2. filtrationThe reaction mixture was then filtered with the aid of EtOAc
3. customthe filtrate evaporated to a residue which
4. dissolutionwas dissolved in a small amount of methylene chloride
5. custompurified by normal phase chromatography

ORD record

ord-491343d6ab5e4ea3b74d7f34779909e7

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09409908B2