2-Methyl-6-nitrobenzoic anhydride → HCID 91667535, compound

Participants

Reaction Steps

A solution of (2S,6R)-2-((tert-butoxycarbonyl)amino)-6-((1R,2S)-2-hydroxy-1-((triisopropylsilyl)oxy)propyl)-9-methyldecanoic acid (7.76 g, 13.1 mmol) in anhydrous CH2Cl2 (500 mL) was added to a solution of MNBA (9.04 g, 26.3 mmol) and DMAP (12.8 g, 105.0 mmol) in anhydrous CH2Cl2 (2.5 L) at room temperature over the course of 4 h. After the addition was complete, the reaction was stirred for 12 h at room temperature, concentrated and purified by column chromatography on SiO2 (gradient, hexanes/ethyl acetate) to furnish the title product as a sticky pale yellow solid (3.98 g, 59%): 1H NMR (400 MHz, CDCl3) δ 5.14 (d, J=8.2 Hz, 1H), 4.90-4.78 (m, 1H), 4.20-4.09 (m, 1H), 3.61 (t, J=7.6 Hz, 1H), 2.26-2.10 (m, 1H), 1.79-1.65 (m, 1H), 1.65-1.40 (m, 3H), 1.44 (s, 9H), 1.37 (d, J=6.5 Hz, 3H), 1.32-0.97 (m, 28H), 0.884 (d, J=6.7 Hz, 3H), 0.878 (d, J=6.7 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 173.12, 154.92, 79.62, 78.59, 75.82, 60.33, 53.07, 45.68, 36.92, 34.17, 28.64, 28.58, 28.31, 27.27, 22.82, 22.49, 18.95, 18.86, 18.38, 18.33, 13.75; ESIMS m/z 536.5 ([M+Na]+).

Provenance & Evidence