4-Methoxybenzaldehyde → Tert-butyl 3-(4-methoxybenzylidene)carbazate

Participants

Reaction Conditions

Reaction Steps

Add 4-methoxybenzaldehyde (400 g, 2.94 mol) over 20 min to a solution of tert-butyl carbazate (400 g, 2.94 mol) in toluene (750 mL) at 50° C. Heat to reflux over a period of 1 hour (h), collecting water in an azeotrope with the toluene. After no further water is collected, cool to 60° C. Add hexanes until the product precipitates from solution. Cool the bath further to 20° C. Collect the solids by filtration and dry using a nitrogen press to afford the title compound (750.5 g, 91%). 1H NMR [400 MHz, dimethyl sulfoxide-d6 (DMSO-d6)] δ 10.6-10.8 (bs, 1H), 7.88-8.0 (S, 1H), 7.5-7.55 (d, 2H), 6.95-7.0 (d, 2H), 1.45 (s, 9H). ES/MS (m/z): 249 [M-H].

Provenance & Evidence