Cesium carbonate → tert-butyl N-[4-[3-[4-(diethoxyphosphorylmethylamino)-2-methylphenyl]phenyl]sulfonyl-5-methylsulfanylthiophene-2-carboximidoyl]carbamate

Participants

Reaction Conditions

Reaction Steps

To a mixture of {[4-(4′-amino-2′-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester (30 mg, 58.0 μmol), as prepared according to the procedure of step b of Example 120, cesium carbonate (19 mg, 58 μmol), and N,N-dimethylacetamide (0.4 mL) was added a solution of trifluoro-methanesulfonic acid diethoxy-phosphorylmethyl ester (18 mg, 58 μmol) (Xu, Y. et al, J. Org. Chem. 61, 7697 (1996); Phillion, D. et al, Tetrahedron Lett. 27, 1477 (1986)), and heated at 50° C. for 48 h. Additional trifluoro-methanesulfonic acid diethoxy-phosphorylmethyl ester (18 mg, 58 μmol) was added. The mixture was heated at 50° C. for additional 24 h. Solvent was evaporated. The resulting mixture was partitioned between DCM and H2O. Aqueous layer was separated and extracted with DCM. All the DCM layers were combined, washed with H2O and brine, dried over Na2SO4, concentrated, and flash chromatographed on silica gel column, eluting with EtOAc/DCM (20 and 30%) to give the title compound (38 mg, 98% yield) as an orange oil. 1H NMR (CDCl3): δ 8.23 (s, 1H), 7.92–7.88 (m, 2H), 7.53–7.46 (m, 2H), 6.98 (d, 1H, J=8.0 Hz), 6.56–6.53 (m, 2H), 4.23–4.15 (m, 4H), 3.56 (d, 2H, J=12.5 Hz), 2.43 (S, 3H), 2.16 (S, 3H), 1.52 (S, 9H), 1.35 (t, 6H, J=7.0 Hz). ESI-MS (m/z): Cald. For C29H39N3O7PS3: 668.2 (M+H); found: 667.8.

Provenance & Evidence