Sodium Hydroxide → 4-amino-1-(2'-amino-6',7'-dihydro-5'H-spiro[cyclopentane-1,8'-quinazoline]-4'-yl)piperidine-4-carboxylic acid

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Reaction Steps

A solution of the product from Example 11 (30 mg, 0.083 mmol) in MeOH (5 mL) was treated with NaOH solution (1 mL, 10%) and stirred for 16 hours. The mixture was concentrated under reduced pressure, and the resulting oil was chromatographed on silica gel (6:1:1 EtOAc/HCO2H/H2O, eluant). The fractions containing the still-impure product were combined and concentrated under reduced pressure, then the residue was again chromatographed on silica gel, this time eluting with NH4OH/MeOH/CH2Cl2 (1.5:13.5:85), to provide the title product. 1H NMR (300 MHz, CD3OD) δ 3.70-3.81 (m, 2 H), 3.45-3.57 (m, 2 H), 2.52 (t, J=5.43 Hz, 2 H), 2.25-2.36 (m, 2 H), 1.98-2.09 (m, 2 H), 1.76-1.94 (m, 6 H), 1.61-1.74 (m, 6 H). MS (DCI+) m/z 346 (M+H) and 368 (M+Na).

Provenance & Evidence