Reaktion #53458

Reaktionsgleichung

sodium borohydride

(RS)-1-{(4-chlorophenyl)(4-formylphenyl)methyl}-3-[(3,5-difluorophenyl)(methylsulfonyl)methylene]azetidine

water

→

(RS)-1-{(4-chlorophenyl)[4-(hydroxymethyl)phenyl]methyl}-3-[(3,5-difluorophenyl)(methylsulfonyl)methylene]azetidine

Ausbeute 57.8%

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionthe product extracted with 100 cm3 of dichloromethane
2. 2
   WaschenThe organic phase is washed twice with 40 cm3 of water
3. 3
   Trocknen40 cm3 of a saturated sodium chloride solution, dried over magnesium sulfate
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated to dryness under reduced pressure (2.7 kPa)
6. 6
   SonstigeThe residue obtained
7. 7
   Sonstigeis chromatographed on a silica gel column (particle size 0.04-0.06 mm, diameter 3.2 cm, height 14 cm), at an argon pressure of 0.5 bar with a mixture of ethyl acetate and cyclohexane (30/70 by volume)
8. 8
   Sonstigecollecting 20 cm3 fractions
9. 9
   Einengenconcentrated to dryness under reduced pressure (2.7 kPa)

Vorschrift

0.020 g of sodium borohydride is added to a solution of 0.50 g of (RS)-1-{(4-chlorophenyl)(4-formylphenyl)methyl}-3-[(3,5-difluorophenyl)(methylsulfonyl)methylene]azetidine in 15 cm3 of methanol at 0° C. After 1 hour at 0° C. , 40 cm3 of water are added and the product extracted with 100 cm3 of dichloromethane. The organic phase is washed twice with 40 cm3 of water and then 40 cm3 of a saturated sodium chloride solution, dried over magnesium sulfate, filtered and concentrated to dryness under reduced pressure (2.7 kPa). The residue obtained is chromatographed on a silica gel column (particle size 0.04-0.06 mm, diameter 3.2 cm, height 14 cm), at an argon pressure of 0.5 bar with a mixture of ethyl acetate and cyclohexane (30/70 by volume) and collecting 20 cm3 fractions. Fractions 20 to 25 are combined and then concentrated to dryness under reduced pressure (2.7 kPa). 0.29 g of (RS)-1-{(4-chlorophenyl)[4-(hydroxymethyl)phenyl]methyl}-3-[(3,5-difluorophenyl)(methylsulfonyl)methylene]azetidine is obtained in the form of a white foam [NMR spectrum in DMSO-d6, T=300K, δ in ppm (250 MHz): 3.02 (3H, s, SCH3), 3.90 (2H, s, NCH2), 4.20 (2H, s, NCH2), 4.42 (2H, d, J=5 Hz, OCH2), 4.75 (1H, s, NCH), 5.10 (1H, t, J=5 Hz, OH), between 7.10 and 7.50 (11H, m, 11CH arom.)].

Quelle