1-Isopropylpiperazine → 3-(4-Isopropylpiperazin-1-yl)benzaldehyde

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(3-bromophenyl)-1,3-dioxane (2, 1.58 g, 6.5 mmol), 1-isopropylpiperazine (1.0 g, 7.8 mmol), rac-BINAP (60 mg, 0.096 mmol), and tert-BuONa (1.06 g, 11.1 mmol) in toluene (15 mL) was degassed under vacuum and flushed with nitrogen. Pd2(dba)3 (30 mg, 0.033 mmol) was added. The reaction mixture was degassed again and flushed with nitrogen and was heated at 100° C. under nitrogen for 16 h. The reaction mixture was poured into cold 1N HCl (30 mL) and stirred for 2 h. It was adjusted to pH 8 with 6N NaOH and extracted with EtOAc (3×50 mL). The combined organic layers were dried (MgSO4), filtered, concentrated, and purified by silica gel chromatography eluting with 0-100% EtOAc (containing 5% v/v Et3N) in hexanes to afford the title compound as a viscous yellow oil (1.32 g, 87%): 1H NMR (500 MHz, CDCl3) δ 9.96 (s, 1H), 7.44-7.37 (m, 2H), 7.34-7.30 (m, 1H), 7.21-7.16 (m, 1H), 3.28 (t, J=5.0 Hz, 4H), 2.73 (sept, J=6.5 Hz, 1H), 2.69 (t, J=5.0 Hz, 4H), 1.10 (d, J=6.5 Hz, 6H); ESI MS m/z 233 [M+H]+.

Provenance & Evidence