Sodium Nitrite → Ethyl 2-(3-bromo-5-chloro-4-hydroxyphenyl)-4-methylpentanoate

Temperature

0 °C

Ethyl 2-(3-amino-5-bromo-4-hydroxyphenyl)-4-methylpentanoate 1 (4 g, 0.012 mol) was dissolved in a mixture of ACN/H2O/HCl 60 mL/30 mL/8 mL at 0° C. A solution of NaNO2 (0.919 g, 1.1 eq) in water (10 mL) was added dropwise at 0° C. and the reaction mixture was stirred for 1 h at 0° C. A solution of CuCl (5.99 g, 0.060 mol) in water (10 mL) was added dropwise to the reaction mixture at 0° C. The reaction mixture was then heated to 50° C. for 2.5 h. upon which the mixture was poured into ice water, extracted with ethyl acetate (3×100 mL) The combined organic layers were washed with water (200 mL) and brine (100 mL), dried over NaSO4 and concentrated in vacuo to give crude black oil which was purified by chromatography over silica gel (hexane/EtOAc) to give ethyl 2-(3-bromo-5-chloro-4-hydroxyphenyl)-4-methylpentanoate as yellow oil 2.2 g, (47.3%). 1H NMR (CDCl3, 200 MHz): 7.38 (s, 1H); 7.4 (s, 1H); 5.80 (bs, 1H); 4.13 (q, 2H); 3.51 (t, 1H); 1.93-1.56 (m, 2H); 1.51 (m, 1H); 1.21 (t, 3H), 0.97 (d, 6H);

1. temperatureThe reaction mixture was then heated to 50° C. for 2.5 h. upon which the mixture
2. extractionextracted with ethyl acetate (3×100 mL) The combined organic layers
3. washwere washed with water (200 mL) and brine (100 mL)
4. dry with materialdried over NaSO4
5. concentrationconcentrated in vacuo
6. customto give crude black oil which
7. customwas purified by chromatography over silica gel (hexane/EtOAc)

ORD record

ord-81216892659b4608a3b04d8a1873b278

Source dataset

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08217064B2