2-hydroxy-4-[methyl(propan-2-yl)amino]benzaldehyde

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Synthesis and working up are carried out as in Example 9, starting from 500 mg (2.59 mmol) of 4-(N-isopropyl-N-methylamino)salicylaldehyde and 109 mg (1.23 mmol) of 1,2-diamino-2-methylpropane. Synthesis

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Synthesis and working up are carried out as in Example 9, starting from 500 mg (2.59 mmol) of 4-(N-isopropyl-N-methylamino)salicylaldehyde and 141 mg (1.23 mmol) of trans-1,2-cyclohexanediamine. Yield: 504 mg (88%), yellow solid. Synthesis

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Synthesis and working up are carried out as in Example 9, starting from 500 mg (2.59 mmol) of 4-(N-isopropyl-N-methylamino)salicylaldehyde and 90 mg (1.5 mmol) of ethylenediamine. Synthesis

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 11 g (0.118 mol) of phosphorus oxychloride are cautiously added to 33 ml of dry DMF at −5° C. within a period of 5 minutes, during the course of which the temperature of the reaction solution should not exceed 10° C. Subsequently, a solution of 19.4 g (0.1176 mol) of 3-(N-isopropyl-N-methylamino)phenol in 25 ml of dry DMF is added thereto within a period of 10 minutes, during the course of which the temperature of the reaction solution should not exceed 20° C. When the addition is complete, the reaction solution is heated for 2 hours at 90° C. and then immediately poured onto 150 g of ice. The crude mixture is extracted three times with 100 ml of chloroform. The combined organic phases are concentrated under a high vacuum. The oily residue is purified by column chromatography on silica gel (eluant n-hexane/chloroform 95:5). Yield: 5.8 g (26%), colourless liquid. exceed 10° C exceed 20° C When the addition The crude mixture is extracted three times with 100 ml of chloroform The combined organic phases are concentrated under a high vacuum The oily residue is purified by column chromatography on silica gel (eluant n-hexane/chloroform 95:5)