Tributylphosphine → methyl 2-[4-[4-[[4-[(2Z)-2-methoxyimino-2-phenylethoxy]phenyl]methoxy]phenyl]-3-methyl-1,2-oxazol-5-yl]acetate

Participants

Reaction Conditions

Reaction Steps

To a 50 mL two neck RB flask fitted with magnetic stirrer was charged with 15 mL of toluene. To the stirred solvent were added methyl [4-(4-hydroxyphenyl)-3-methyl-1,2-oxazol-5-yl]acetate (0.3 g, 1.21 mmol), (1Z)-2-[4-(hydroxymethyl)phenoxy]-1-phenylethanone O-methyloxime (0.33 g, 1.21 mmol) and tri-(n-butyl)phosphine (0.39 g, 1.94 mmol) under nitrogen atmosphere. The reaction mixture was cooled to 0° C. and 1,1′-(azodicarbonyl)-dipiperidine (0.49 g, 1.94 mmol) was added portion wise and stirred at room temperature for 2 h. After completion of the reaction, the reaction mixture was poured into water (20 mL) and extracted with ethyl acetate (25 mL). The organic layer was dried over anhydrous Na2SO4 and the solvent was removed under reduced pressure. The crude material was purified by silica gel column chromatography using ethyl acetate and petroleum ether as eluents. The product was obtained as colorless oil (0.47 g, yield: 77%). 1H NMR (300 MHz, CDCl3): δ 7.57-7.61 (m, 2H), 7.26-7.30 (m, 5H), 7.11-7.14 (d, 2H), 6.94-6.97 (d, 2H), 6.85-6.88 (d, 2H), 5.14 (s, 2H), 4.93 (s, 2H), 3.99 (s, 3H), 3.68 (s, 2H), 3.65 (s, 3H), 2.20 (s, 3H).

Provenance & Evidence