Pyridine → HCID 25019282, compound

Participants

Reaction Steps

A solution of 1-amino-3-[2-(4-methoxyphenyl)-ethyl]-4-(R)-(4-methoxyphenyl)-2-imidazolidinone (247 g, 0.72 mol) in dichloromethane (2.35 L) and pyridine (174 mL, 2.15 mol) is cooled in an ice bath to 18° C. Methanesulfonyl chloride (73 mL, 0.94 mol) is added dropwise. The reaction is stirred cold for 2.5 hours then washed with 0.5 N HCl (2×1.5 L), brine (2×1.5 L) and dried (Na2SO4). The solvent is then removed in vacuo to afford a mixture of the desired product (75%) and unreacted starting material (25%) which is separated by liquid chromatography. [α]20D −39.83 (c 0.89, CHCl3) 1H NMR (300 MHz, CDCl3) δ 7.16 (d, J=8.81, 2H, ArH), 7.02 (d, J=8.51, 2H, ArH), 6.91 (d, J=8.81, 2H, ArH), 6.80 (d, J=8.81, 2H, ArH), 4.41 (m, 1H), 3.92 (m, 1H), 3.82 (s, 3H, CH3), 3.77 (s, 3H, CH3), 3.60-3.72 (m, 1H), 3.30 (m, 1H), 3.03 (s, 3H, CH3), 2.87-2.98 (m, 1H), 2.53-2.79 (m, 3H). MS 418 (MH+). Anal. Calcd. for C21H27N3O4S¼H2O: C, 59.77, H, 6.57; N, 9.96. Found: C, 59.82, H, 6.06; N, 9.85. FAB-HRMS: anal. calcd for C21H27N3O4S: 418.18005. Found: 418.17960.

Provenance & Evidence