Sodium triacetoxyborohydride → benzhydryl 1-[(Z)-[2-[[(2R,3S)-2-[[2-(9H-fluoren-9-ylmethoxycarbonylamino)ethylamino]methyl]-4-oxoazetidin-3-yl]amino]-1-[2-[(2-methylpropan-2-yl)oxycarbonylamino]-1,3-thiazol-4-yl]-2-oxoethylidene]amino]oxycyclopropane-1-carboxylate

Participants

Reaction Steps

To a solution of benzhydryl 1-(((Z)-(2-(((2R,3S)-2-(aminomethyl)-4-oxoazetidin-3-yl)amino)-1-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)-2-oxoethylidene)amino)oxy)cyclopropanecarboxylate (199 mg, 0.29 mmol) in DCE (2.9 mL) was added (9H-fluoren-9-yl)methyl (2-oxoethyl)carbamate (84 mg, 0.30 mmol) and sodium triacetoxyborohydride (181 mg, 0.86 mmol). After 12 h, the reaction mixture was quenched with saturated NaHCO3 (aq), diluted with EtOAc, and the layers were separated. The aqueous layer was extracted with EtOAc, and the combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude residue was purified via silica gel chromatography (MeOH-DCM, 0-100%) to afford the title compound (150 mg, 58%). LCMS: Rt=1.10 min, m/z=900.0 (M+1), Method 2m_acidic. 1H NMR (400 MHz, DMSO-d6): 9.16 (d, J=9.0 Hz, 1H), 8.35 (s, 1H), 7.87 (d, J=7.4 Hz, 2H), 7.66 (d, J=7.4 Hz, 2H), 7.45-7.18 (m, 16H), 6.83 (s, 1H), 5.24-5.17 (m, 1H), 4.28 (d, J=6.7 Hz, 2H), 4.19 (d, J=6.3 Hz, 1H), 3.79-3.67 (m, 1H), 3.03-2.95 (m, 2H), 2.73-2.63 (m, 1H), 1.54-1.37 (m, 13H).

Provenance & Evidence