HCID 131727245, compound → HCID 85850727, compound

Participants

Reaction Steps

A solution of 1.78 g (5.5 mmol) of (R/S)-1-tert-butoxycarbonyl-3-hydroxy-pyrrolidin-3-yl phosphonic acid, diethyl ester (from Step C) in 2N HCl in EtOH was stirred at rt for 5.5 h. The reaction was concentrated from CH2Cl2 several times. The crude product was partitioned between aqueous NH4OH and CHCl3/isopropanol (3:1 v/v). After separating phases, the aqueous layer was extracted with 3× CHCl3/isopropanol (3:1 v/v). The combined organics were dried over Na2SO4 and concentrated. The residue was purified on a 40S Biotage column using 90:10:1 v/v/v CH2Cl2/MeOH/NH4OH as the eluant to afford the title compound as a light brown oil: 1H-NMR (500 MHz) δ 1.35 (t, J=7.0, 6H), 1.92 (m, 1H), 2.20 (m, 1H), 2.78-2.99 (m, 3H), 3.06 (dd, J=12.7, 3.7, 1H), 3.13 (dd, J=12.7, 6.2, 1H), 3.20 (m, 1H), 4.16-4.23 (m, 4H).

Provenance & Evidence