Reacción #1960815

Ecuación de reacción

(2S)-2-(6-methoxy(2-naphthyl))propanoic acid

(R)-(+)-3-benzyloxy-1,2-propanediol

1,3-dicyclohexylcarbodiimide

→

(2R)-2-hydroxy-3-(phenylmethoxy)propyl(2S)-2-(6-methoxy(2-naphthyl))propanoate

Disolventes

CH2Cl2

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe byproduct, dicyclohexyl urea, was removed by filtration
2. 2
   OtroThe reaction mixture was partitioned between HCl (3N, 50 mL) and CH2Cl2 (50 mL×2)
3. 3
   LavadoThe combined organic extracts were back washed with water, brine
4. 4
   Secadodried over Na2SO4
5. 5
   Filtraciónfiltered
6. 6
   Concentraciónconcentrated
7. 7
   Otrodried under vacuum
8. 8
   OtroThe product was separated by silica gel column chromatography
9. 9
   Lavadoeluting with EtOAc:hexane (1:2, Rf=0.23)
10. 10
    Otroto give

Procedimiento

A solution of (2S)-2-(6-methoxy(2-naphthyl))propanoic acid (naproxen, 3.70 g, 16.1 mmol), (R)-(+)-3-benzyloxy-1,2-propanediol (2.92 g, 19.0 mmol), N,N-dimethylaminopyridine (DMAP, 0.40 g, 3.3 mmol) and 1,3-dicyclohexylcarbodiimide (3.61 g, 17.5 mmol) in CH2Cl2 (120 mL) was stirred at ambient temperature overnight. The byproduct, dicyclohexyl urea, was removed by filtration. The reaction mixture was partitioned between HCl (3N, 50 mL) and CH2Cl2 (50 mL×2). The combined organic extracts were back washed with water, brine, dried over Na2SO4, filtered, concentrated and dried under vacuum. The product was separated by silica gel column chromatography eluting with EtOAc:hexane (1:2, Rf=0.23) to give a mixture of the 1- and 2-glycerol ester isomers (88:12, 3.87 g). 1H NMR (300 MHz, CDCl3) δ 7.69-7.64 (m, 3H), 7.40-7.03 (m, 8H), 5.34 (s, 2H), 4.17-4.14 (m, 2H), 3.88 (s, 3H), 3.9-3.85 (m, 2H), 3.33-3.28 (m, 2H), 2.45 (br. d, 1H), 1.56 (d, J=7.2 Hz, 3H). 13C NMR (75 MHz, CDCl3) δ 174.6, 157.6, 137.6, 135.4, 133.6, 129.6, 129.2, 128.8, 128.3, 127.7, 127.61, 127.55, 127.1, 126.1, 125.9, 119.0, 105.5, 73.3, 70.6, 68.8, 65.5, 62.2, 55.2, 45.3, 18.3. Mass spectrum (API-TIS) m/z 412 (M+NH4)+.

Fuente