Propylphosphonic anhydride → 3-(3-Bromophenethoxy)-N-cyclohexyl-N-(2,2-dimethoxyethyl)propanamide

To a stirred solution of 3-(3-bromophenethoxy)propanoic acid (3.3 g, prepared as in Preparation 3, Step ii), Procedure B) in acetonitrile (60 mL) was added TEA (20.21 mL) and N-(2,2-dimethoxyethyl)cyclohexanamine (2.26 g). T3P (1.56M in THF, 15.39 mL) was then added portionwise. The reaction was stirred overnight, and then worked up by the addition of saturated sodium hydrogen carbonate, which was extracted twice with ethyl acetate. The pooled organics were washed once with water, once with brine, dried over sodium sulphate, filtered and the solvent removed to afford a brown oil, which was purified on silica (5% Ethyl acetate/isohexane to 20% Ethyl acetate/isohexane). The solvent was evaporated to afford an orange oil (4.5 g). MS [M+H-MeOH]+=410/412 (MultiMode+) 1H NMR (400 MHz, CD3OD) δ 7.40-7.35 (m, 1H), 7.33-7.29 (m, 1H), 7.20-7.12 (m, 2H), 4.54 (t, J=5.0 Hz, 0.5H), 4.39 (t, J=5.4 Hz, 0.5H), 4.08-3.98 (m, 1H), 3.73-3.59 (m, 4H), 3.39-3.36 (m, 2H), 3.37 (s, 3H), 3.34 (s, 3H), 2.83-2.78 (m, 2H), 2.67-2.61 (m, 2H), 1.82-1.74 (m, 2H), 1.70-1.55 (m, 3H), 1.55-1.42 (m, 2H), 1.38-1.26 (m, 2H), 1.19-1.04 (m, 1H), a ˜1:1 mixture of rotamers is observed.

1. extractionwas extracted twice with ethyl acetate
2. washThe pooled organics were washed once with water, once with brine
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. customthe solvent removed
6. customto afford a brown oil, which
7. customwas purified on silica (5% Ethyl acetate/isohexane to 20% Ethyl acetate/isohexane)
8. customThe solvent was evaporated

ORD record

ord-15696f7c5ab34a9eb7052976e4168a49

Source dataset

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08017602B2