Epichlorohydrin → HCID 54757206, compound

Participants

Reaction Steps

To a solution of compound 18 (0.65 g, 1.5 mmol) in anhydrous MeOH (10 mL) was added potassium hydroxide (0.42 g, 7.5 mmol). The mixture was refluxed for 4 h and then cooled to room temperature. Epichlorohydrin (0.21 g, 2.3 mmol) was added dropwise and the mixture was stirred at room temperature for 15 min, after which the solvent was removed under reduced pressure. The concentrate was diluted with water and extracted with EtOAc. The combined organic extracts were dried over anhydrous Na2SO4, the suspension was filtered, followed by concentration of the filtrate in vacuo. Purification by silica gel chromatography (hexanes/EtOAc=4/1) gave 19 in 68% yield (0.43 g) 1H NMR (500 MHz, CDCl3) δ 1.53 (s, 9H), 8.03 (br. s., 1H), 2.47 (dd, J=2.6, 5.0 Hz, 1H), 2.77 (t, J=4.4 Hz, 1H), 2.85 (dd, J=6.1, 13.9 Hz, 1H), 3.12-3.05 (m, 1H), 3.18-3.12 (m, 1H), 5.18 (s, 2H), 3.48 (s, 3H), 6.66 (dd, J=2.6, 8.8 Hz, 1H), 6.92-6.85 (m, 3H), 6.98 (br. s., 1H), 7.44-7.37 (m, 2H). 13C NMR (126 MHz, CDCl3) δ 28.5, 38.2, 47.6, 51.3, 56.5, 80.6, 95.4, 106.8, 113.1, 118.4, 119.4, 125.1, 128.0, 131.8, 133.8, 146.6, 151.2, 152.9, 157.9. HRMS (FAB) calcd for C22H28NO4S (M+H+) 434.1632. found 434.1637.

Provenance & Evidence