4-Hydroxybenzaldehyde → 4-[2-(5-Ethyl-2-pyridinyl)-2-hydroxyethoxy]benzaldehyde

Participants

Reaction Steps

Into a stirred mixture of 4.5 lit. tert-butanol and 13.5 lit. water was added 1.2 Kg (9.02 mole) 5-ethyl-2-vinyl-pyridine at 25° C. To this was added 1.926 Kg (10.82 mol) N-bromosuccinimide and reaction mixture was stirred for 1.5 hr. 13.5 lit. aqueous 2N NaOH solution was added to the reaction mixture and stirring was continued for further 45 min. Progress of reaction was monitored by TLC and after completion of reaction, product was extracted with 12 lit. methyl tert-butyl ether. Layers were separated, organic layer was washed with 7.2 lit. brine solution, dried (magnesium sulfate) and concentrated under reduced pressure. The residual solid obtained was added into a stirred mixture of 1.59 Kg (13 mol) 4-hydroxy benzaldehyde dissolved in 13 lit. toluene and 523 g (130 mol) NaOH dissolved in 120 lit. water. To this was added 221 g PEG 2000 and stirred for 17 hr. at 78° C. Subsequent work-up gave 2.029 Kg (83%) 4-[2-(5-ethyl-pyridin-2-yl)-2-hydroxy-ethoxy]-benzaldehyde. m.p. 81° C.

Provenance & Evidence