Butanethiol → 3-(4-Butylsulfanyl-isoxazol-3-yl)-pyridine

To a degassed solution of dioxane (40 ml) containing 64 (1.0 g, 4.44 mmol), were added 1.2 eq (0.62 ml) of butane-1-thiol and 2 eq of triethylamine (1.52 ml). The resulting mixture was stirred for another 2 hours under N2. Successively were added 2.5 mol % of Pd2(dba)3 (100 mg) and 5 mol % of Xantphos (128 mg). After the addition, the resulting solution was stirred for 18 hours at 95° C. under N2. After cooling to room temperature, the mixture was diluted with ethyl acetate, washed with a saturated NaHCO3 solution, dried (Na2SO4), filtered and concentrated. The resulting residue was purified by flash chromatography (diethyl ether) to afford 3-(4-butylsulfanyl-isoxazol-3-yl)-pyridine (65A) as an oil (0.26 g, 25%). (TLC diethyl ether Rf 0.54). 1H-NMR (400 MHz, CDCl3): δ 9.24 (d, J=2 Hz, 1H), 8.72 (dd, J=5 Hz, 2 Hz, 1H), 8.49 (s, 1H), 8.31 (dt, J=8 Hz, 2 Hz, 1H), 7.45-7.41 (m, 1H), 2.61 (t, J=7 Hz, 2H), 1.52-1.43 (m, 2H), 1.39-1.29 (m, 2H), 0.83 (t, J=7 Hz, 3H).

1. additionAfter the addition
2. stirringthe resulting solution was stirred for 18 hours at 95° C. under N2
3. washwashed with a saturated NaHCO3 solution
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe resulting residue was purified by flash chromatography (diethyl ether)

ORD-Eintrag

ord-688b50a3f2124b6cac65f5a524c34d15

Quelldatensatz

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08586606B2