Tetrahydrofuran → (4-Hydroxy-4-trifluoromethyl-piperidin-1-yl)-[5-(4-methyl-5-trifluoromethyl-isoxazol-3-yl)-thiophen-2-yl]-methanone

Participants

Reaction Steps

Prepared from 5-(4-Methyl-5-trifluoromethyl-isoxazol-3-yl)-thiophene-2-carboxylic acid and 4-hydroxy-4-trifluoromethyl-piperidine by the method described in Example 2 Method B reversing the order of addition such that solid acid chloride was added to a THF solution of triethylamine and piperidine derivative. The reaction mixture was evaporated to a solid, triturated and filtered with the aid of water, then washed with a 1 N aqueous hydrochloric acid solution followed by water. The solid was air dried and then chromatographed on silica gel with EtOAc/hexanes (50%) as eluant to afford product as a colorless solid (53 mg, 49%). 1H NMR (DMSO-d6) 1.70-1.72 (m, 4 H), 2.34 (d, J=1.8, 3 H), 3.24 (br, 2 H), 4.19 (br, 2 H), 6.17 (s, 1 H), 7.56 (d, J=4.0, 1 H), 7.65 (d, J=4.0, 1 H). 19F NMR −83.5, −63.1. LC/MS 6.40 min, [M+1]+429.

Provenance & Evidence