反応 #56018

反応方程式

iodobenzene dichloride

water

pyridine

Benzyl 3-(2-acetamidoethylthio)-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylate

→

Benzyl 3-(2-acetamidoethylsulphinyl)-3-chloro-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylate

溶媒

chloroform

反応条件

後処理

1. 1
   その他A period of 2 hours
2. 2
   濃縮the solution was concentrated
3. 3
   その他the product chromatographed on silica gel 60 (<230 mesh)
4. 4
   洗浄eluting with chloroform/ethanol 9:1

実験手順

Benzyl 3-(2-acetamidoethylthio)-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (91) (0.050 g) was dissolved in chloroform (5 ml) and stirred at 0° under argon. It was treated with water (0.010 g) and pyridine (0.022 g) followed by iodobenzene dichloride (0.038 g). A period of 2 hours was allowed to elapse and the solution was concentrated and the product chromatographed on silica gel 60 (<230 mesh) eluting with chloroform/ethanol 9:1. This gave benzyl 3-(2-acetamidoethylsulphinyl)-3-chloro-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (62) (0.040 g); m.p. 89°-93°, νmax (CHCl3) 3450, 2980, 1780, 1745, 1670 and 1515 cm-1 ; τ(CDCl3) 2.70 (5H, s, phenyl), 3.70 (1H, br, NH) 4.88 (2H, s, benzyl CH2) 4.97 (1H, s, C2-H), 5.6- 5.9 (1H, m, C5-H), 6.40 (2H, q J 5 Hz, NCH2), 6.6-7.0 (4H, m, SCH2 and C6-H2), 7.05 (1H, dd J 15 and 8 Hz, C4-H), 7.68 (1H, dd J 15 and 2 Hz, C4-H) and 8.07 (3H, s, COCH3); (Found: C, 52.1; H, 5.4; N, 6.9%, C18H21ClN2O5S requires C, 52.4; H, 5.1 and N, 6.8%).

出典