Methanol → t-Butyl (6R,7R)-7-amino-3-[(4RS)-2-oxotetrahydrofuran-4-yl]ceph-3-em-4-carboxylate

HRID 6294

反応式

HRID 6294 の反応式
P(Cl)(Cl)(Cl)(Cl)Cl.[O:7]=[C:8]1[CH2:12][CH:11]([C:13]2[CH2:14][S:15][C@@H:16]3[C@H:27]([NH:28]C(=O)COC4C=CC=CC=4)[C:26](=[O:39])[N:17]3[C:18]=2[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:10][O:9]1.CN1CCOCC1.CO>ClCCl.O>[NH2:28][C@@H:27]1[C:26](=[O:39])[N:17]2[C:18]([C:19]([O:21][C:22]([CH3:23])([CH3:24])[CH3:25])=[O:20])=[C:13]([CH:11]3[CH2:10][O:9][C:8](=[O:7])[CH2:12]3)[CH2:14][S:15][C@H:16]12

参加物

7

反応物 4

HCID 887MethanolHCID 79724-MethylmorpholineHCID 24819Phosphorus pentachlorideHCID 53910961t-butyl (6R,7R)-3-[(4RS)-2-oxotetrahydrofuran-4-yl]-7-phenoxyacetamidoceph-3-em-4-carboxylate

生成物 1

HCID 53649045t-Butyl (6R,7R)-7-amino-3-[(4RS)-2-oxotetrahydrofuran-4-yl]ceph-3-em-4-carboxylate収率 29.4%

試薬・触媒・溶媒 2

HCID 962Water溶媒HCID 6344Dichloromethane溶媒2 回

実験手順

A solution of phosphorous pentachloride (0.380 g, 1.8 mmol) in dichloromethane (9.5 ml) was added to t-butyl (6R,7R)-3-[(4RS)-2-oxotetrahydrofuran-4-yl]-7-phenoxyacetamidoceph-3-em-4-carboxylate (0.554 g, 1.2 mmol) and N-methylmorpholine (265 μh, 2.4 mmol) in dichloromethane (15 ml) at <-20° C. under argon. Stirred 0.5 h at -15°±5° C. then methanol (3.5 ml) added, stirred 0.75 h then water (10 ml) added and stirred vigorously 1 h. The dichloromethane was removed in vacuo. ethyl acetate added and the aqueous layer adjusted to pH7 with dilute ammonium hydroxide and extracted twice with ethyl acetate. The extracts were washed with brine, dried, concentrated and flash chromatographed on silica gel eluting with 40,50,60,70,75% ethyl acetate in hexane to provide the title compound as a foam (0.120 g, 29%): (Found: M+, 340.1113. C15H20N2O5S requires M, 340.1093); νmax (CH2Cl2) 1775, 1715, 1367, 1155 cm-1 ; δH (250 MHz, CDCl3) 1.54 (9H, s , 1.97 (2H, bs), 2.35-2.95 (2H, m), 3.26 and 3.49 3.28 and 3.49 (2H, 2ABq, J 17.7 Hz), 4.0-4.45 (3H, m), 4.77, 4.79 (1H, 2d, J 4.7 Hz), 4.93, 4.95 (1H, 2d, J 4.7 Hz).

後処理

  1. stirringstirred 0.75 h
  2. stirringstirred vigorously 1 h
  3. customThe dichloromethane was removed in vacuo
  4. additionethyl acetate added
  5. extractionextracted twice with ethyl acetate
  6. washThe extracts were washed with brine
  7. customdried
  8. concentrationconcentrated
  9. customflash chromatographed on silica gel eluting with 40,50,60,70,75% ethyl acetate in hexane

出典と根拠

ORDレコード
ord-4d70e3eec3d34997a22908f6fa4984e9
出典データセット
uspto-grants-1993_09
特許番号
US05246926

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