Hydrochloric Acid → Florfenicol amine

HRID 507887ノート

反応式

HRID 507887 の反応式
C([N:5]1[C@H:9]([CH2:10][F:11])[C@@H:8]([C:12]2[CH:17]=[CH:16][C:15]([S:18]([CH3:21])(=[O:20])=[O:19])=[CH:14][CH:13]=2)[O:7]C1(C)C)(=O)CC.Cl.[OH-].[Na+].C(Cl)Cl>O>[CH3:21][S:18]([C:15]1[CH:14]=[CH:13][C:12]([C@@H:8]([OH:7])[C@H:9]([NH2:5])[CH2:10][F:11])=[CH:17][CH:16]=1)(=[O:20])=[O:19]

参加物

6

反応物 4

HCID 313Hydrochloric AcidHCID 6344DichloromethaneHCID 14798Sodium HydroxideHCID 68470798(4S,5R)-3-propionyl-2,2-dimethyl-4-fluoromethyl-5-[4-(methylsulfonyl)phenyl]-1,3-oxazolidine2 回

生成物 1

HCID 156406Florfenicol amine

試薬・触媒・溶媒 1

HCID 962Water溶媒

実験手順

(4S,5R)-3-acetyl-2,2-dimethyl-4-fluoromethyl-5-[4-(methylsulfonyl)phenyl]-1,3-oxazolidine (Compound IX: R1 is methylsulfonyl; R2, R3 and R4 are methyl) (50.0 g, 0.1518 moles) hydrolyses in water (300 mL) containing 20% hydrochloric acid at 90 to 100° C. over about 1 hour. Adjusting the pH to greater than 12 by addition of sodium hydroxide and extraction with methylene chloride (500 mL) yields (1R,2S)-1-[4-(methylsulfonyl)phenyl]-2-amino-3-fluoro-1-propanol (Compound Xa) in solution. Addition of triethylamine (16.9 g, 0.1670 moles) and dichloroacetyl chloride (24.6 g, 0.1670 moles) at 20-30° C. for 4-6 hours then removal of methylene chloride by distillation and replacement by toluene (350 mL) and water (100 mL) precipitates the product. Filtration, washing with water (150 mL) and toluene (150 mL) then drying yields (1R,2S)-2-dichloroacetamido-3-fluoro-1-[4-(methylsulfonyl)phenyl]-1-propanol (Florfenicol).

出典と根拠

ORDレコード
ord-4d68ce7f4f734ed58056cd5d8f116d62
出典データセット
uspto-grants-2010_08
特許番号
US07786329B2

反応ノート

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