反应详情

A mixture of 3,4-diisopropoxy-3-cyclobutene-1,2-dione (1.0 g, 5.05 mmol) and diethylamine (549 μl, 5.30 mmol) in EtOH (25 ml) was stirred overnight at room temperature. The solvent was removed in vacuo to give the title compound as a yellow oil (1.0 g). δH (DMSO-d6, 390 K) 5.33-5.27 (1H, m), 3.58 (4H, q, J 7.1 Hz), 1.42 (6H, d, J 6.1 Hz), 1.23 (6H, t, J 7.2 Hz); m/z (ES+, 70 V) 212 (MH+).

1. customThe solvent was removed in vacuo