Diisopropylethylamine → HCID 69937553, compound

Participants

Reaction Steps

A solution of lithium (R)-1-(3-(quinuclidin-3-ylamino)propyl)-1H-indole-7-carboxylate (574 mg, 1.7 mmol) from Step D above in DMF (8 mL) was cooled in an ice bath while N,N-diisopropylethylamine (1.3 g, 10.3 mmol) was added, followed by 1-propanephosphonic acid cyclic anhydride (T3P) (3.3 g, 10.3 mmol). The reaction mixture was stirred at room temperature for 5 h. The reaction was quenched with water and the aqueous phase was extracted with methylene chloride (3×) and the combined extracts were washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude material was purified by column chromatography (silica gel, 80:18:2 methylene chloride/methanol/concentrated ammonium hydroxide) to give (R)-2-(quinuclidin-3-yl)-2,3,4,5-tetrahydro-1H-[1,5]diazocino[3,2,1-hi]indol-1-one (127 mg, 24%) as an off-white solid: 1H NMR (300 MHz, CD3OD) δ 7.67 (d, J=6.6 Hz, 1H), 7.33 (d, J=7.5 Hz, 1H), 7.20 (d, J=3.3 Hz, 1H), 7.11 (t, J=7.8 Hz, 1H), 6.50 (d, J=3.0 Hz, 1H), 4.40-4.20 (m, 2H), 3.80-3.45 (m, 3H), 3.25-2.80 (m, 5H), 2.30-1.50 (m, 6H), 1.40-1.20 (m, 2H); MS (ESI+) m/z 310 (M+H).

Provenance & Evidence