Tetrabutylammonium Fluoride → HCID 145857615, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 6-{3-[3′-[5-(tert-butoxycarbonylamino-imino-methyl)-2-methylsulfanyl-thiophene-3-sulfonyl]-6-methyl-4-(2-trimethylsilanyl-ethoxycarbonylamino)-biphenyl-2-yl]-ureido}-hexanoic acid ((Example 259: step b) 0.422 g, 0.506 mmol) in dry THF (20 mL) was treated with tetrabutylammonium fluoride (1 M in hexanes, 3.39 mL, 3.39 mmol) and stirred at 40° C. 4 h. Solvents were evaporated in vacuo. The residue was taken up in CH2Cl2 and washed with water (4×50 mL). The organic layer was dried over MgSO4 and concentrated in vacuo. Silica gel chromatography (4% MeOH in CH2Cl2) afforded the product 6-(3-{4-amino-3′-[5-(tert-butoxycarbonylamino-imino-methyl)-2-methylsulfanyl-thiophene-3-sulfonyl]-6-methyl-biphenyl-2-yl}-ureido)-hexanoic acid (0.200 g, 57%) as an off-white solid. The material was combined with 1,3-bis(tert-butoxycarbonyl)-2-methyl-2-thiopseudourea (0.252 g, 0.870 mmol) and acetic acid (0.5 mL) in MeOH (10 mL) and was stirred at 40° C. 2 h. The solvent was removed in vacuo. Silica gel chromatography (4% MeOH in CH2Cl2 then 10% MeOH in CH2Cl2) afforded the title compound (0.215 g, 80%) as a white solid. 1H-NMR (CD3OD): δ 8.22 (s, 1H), 8.06 (m, 1H), 7.89 (m, 1H), 7.72 (m, 1H), 7.69 (m, 1H), 7.53 (m, 1H), 7.32 (m, 1H), 3.01 (m, 2H), 2.66 (s, 3H), 2.27 (t, 2H, 7.4 Hz), 1.97 (s, 3H), 1.57 (m, 2H), 1.54 (s, 18H), 1.51 (s, 9H), 1.37 (m 2H), 1.27 (m, 2H).

Provenance & Evidence