It is a common heterocyclic compound, the Thiomorpholine compound, Thiomorpholine 1,1-dioxide, cas is 39093-93-1 its synthesis route is as follows.
i) (1,1-Dioxo-1,6-thiomorpholin-4-yl)-{6-[3-(5-fluoro-pyridin-2-yl)-5-hydroxymethyl-isoxazol-4-ylmethoxy]-pyridin-3-yl}-methanone; To a solution of 6-((3-(5-fluoropyridin-2-yl)-5-(hydroxymethyl)isoxazol-4-yl)methoxy)nicotinic acid (384 mg, 1.11 mmol) in DMF (10 mL) was added thiomorpholine 1,1-dioxide (165 mg, 1.22 mmol), N,N,N’,N’-tetramethyl-O-(benzotriazole-1-yl)-uronium tetrafluoroborate (393 mg, 1.22 mmol) and N,N-diisopropyl ethylamine (0.95 mL, 5.56 mmol). The reaction mixture was stirred for 30 min at room temperature. After evaporation of the solvent the residue purified by chromatography (silica, ethylacetate_heptane=1:1 to 1:0) to afford the title compound (422 mg, 82percent) as a white solid. MS: m/e=463.2 [M+H]+.
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Reference£º
Patent; Buettelmann, Bernd; Gabriel, Stephen Deems; Hanlon, Steven Paul; Jakob-Roetne, Roland; Lucas, Matthew C.; Spurr, Paul; Thomas, Andrew; Waldmeier, Pius; US2010/256127; (2010); A1;,
Thiomorpholine – Wikipedia
Thiomorpholine | C4H9NS – PubChem