ChemicalBook CAS DataBase List 2-FLUORO-5-HYDROXYBENZOIC ACID

2-FLUORO-5-HYDROXYBENZOIC ACID synthesis

7synthesis methods

Product Name:2-FLUORO-5-HYDROXYBENZOIC ACID
CAS Number:51446-30-1
Molecular formula:C7H5FO3
Molecular Weight:156.11

1084801-91-1

51446-30-1

Step 1: Methyl 2-fluoro-5-hydroxybenzoate (30.0 g, 176.47 mmol, 1.0 eq.) was dissolved in a solvent mixture of THF and H2O (3:1 v/v, total 350 mL). To this solution was added LiOH-H2O (22.2 g, 529.41 mmol, 3.0 eq.) at room temperature. The reaction mixture was stirred at room temperature for 16 hours. After completion of the reaction, THF was removed by distillation under reduced pressure and the residue was diluted with cold water. The pH was adjusted to about 3 with 1.5 N HCl aqueous solution and the aqueous phase was extracted with EtOAc (3 x 250 mL). The organic phases were combined, washed with brine (150 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to give 2-fluoro-5-hydroxybenzoic acid as an off-white solid (25.1 g, 91% yield).MS m/z: [M-1]? = 155.4.

146328-85-0
289 suppliers
$6.00/1g

51446-30-1
160 suppliers
$18.00/1g

Yield: 87%

Reaction Conditions:

Stage #1:5-bromo-2-fluoro-benzoic acid with water;sodium carbonate for 1 h;Reflux;
Stage #2: with (R,R)-N,N'-dimethyl-1,2-diaminocyclohexane;copper(ll) bromideReflux;

Steps:

n
Na2CO3 (1 eq.) was added to a degassed souUon of water (0.35 M) and the appropriatebromobenzoc acid (1 eq.) and was refluxed for 30 minutes. A further portion of Na2CO3 (1.5eq.) was added to the reaction and refluxed for a further 30 mnutes. Separat&y CuBr2 (0.1 eq.) and trans-N, W-dmethycycohexane-1 ,2-damne (0.2 eq.) were added to degassed water (0.04 M) and an ntense bue coour was observed. This mixture was added to the refluxng aqueous souton and aflowed to sUr at this temperature overnight. The resuWngsouton was aflowed to coo to room temperature and was acid Wed with conc. HC and extracted nto EtOAc. The organcs were dried with MgSO4, ffltered, and the sovent removed in vacuo to give the desired product.The foHowng compounds were made by the Uflmann transformaUon method A Al)H5bromo-2- fluorobenzoc acid (3.5g, 15.98 mmo)Off whte sohd (2.16g, 87% yed). 1H NMR(400 MHz, DM80) 6 7.18 (dd, J = 6.0, 3.2Hz, 1H), 7,09 (dd, J= 10.5, 8.9 Hz, 1H), 6.98 6.93 (m, 1H). LCM8 B rt 3.19 mn, m/z157.1 [M + H].

References:

MONASH UNIVERSITY;THE WALTER AND ELIZA HALL INSTITUTE OF MEDICAL RESEARCH;VOSS, Anne Kathrin;BAELL, Jonathan;NGUYEN, Huu Nghi;LEAVER, David J.;CLEARY, Benjamin L.;LAGIAKOS, H. Rachel;SHEIKH, Bilal Nadeem;THOMAS, Timothy John WO2016/198507, 2016, A1 Location in patent:Page/Page column 40; 47

1084801-91-1 Synthesis

1084801-91-1
70 suppliers
$30.00/1g

51446-30-1
160 suppliers
$18.00/1g

References