Diisopropylethylamine → HCID 67505722, compound

Participants

Reaction Steps

A solution of Boc-Tle-OH (463 mg, 2.0 mmol) in NMP (6 mL) was cooled to 0° C. and treated with HATU (758 mg, 2.0 mmol) and DIPEA (0.45 mL, 2.5 mmol). After 10 min, amine 80 (772 mg, 2.0 mmol) in NMP (6 mL) was added. The reaction mixture was allowed to warm to ambient temperature. After 16 h, the solution was diluted with EtOAc, washed successively with 1M HCl, saturated aqueous NaHCO3, and brine, dried over anhydrous Na2SO4, filtered and concentrated. The residue was diluted with ACN/water and purified by RP-HPLC (2″ Dynamax® C18, 20% ACN/water to 100% ACN over 30 min; Flow: 40 mL/min). The product-containing fractions were combined, concentrated, and extracted with EtOAc. The organic extract was washed successively with saturated aqueous NaHCO3, and brine, dried over anhydrous Na2SO4, and filtered. The aqueous phase was back-extracted with DCM and the combined organic extracts were concentrated to afford 81 (269 mg) as an off-white foam. 1H NMR (CDCl3, 300 MHz): δ7.37-7.28 (m, 5H), 7.02 (app q, J=9.0 Hz, 1H), 6.66 (m, 1H), 6.52 (m, 1H), 5.28 (d, J=9.6 Hz, 1H), 5.19-5.13 (m, 2H), 4.46 (m, 2H), 4.31 (d, J=9.9 Hz, 1H), 4.01-3.98 (m, 2H), 3.85-3.76 (m, 2H), 3.46-3.37 (m, 2H), 2.81 (app q, J=5.7 Hz, 1H), 2.43 (m, 1H), 2.26 (m, 1H), 1.43 (s, 9H), 0.99 (s, 9H) ppm. Mass spectrum, m/z [602.8] (M+H)+.

Provenance & Evidence