(Trifluoromethyl)trimethylsilane → (2R,3R)-3-(tert-Butyl-dimethylsilanyloxy)-2-[(1R)-(2,2,2-trifluoro-1-hydroxyethyl)]pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 1864706ノート

反応式

HRID 1864706 の反応式
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@@H:10]([O:13][Si:14]([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15])[C@H:9]1[CH:21]=[O:22])=[O:7])([CH3:4])([CH3:3])[CH3:2].C[Si](C)(C)[C:25]([F:28])([F:27])[F:26]>[F-].[Cs+].Cl>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@@H:10]([O:13][Si:14]([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15])[C@H:9]1[C@@H:21]([OH:22])[C:25]([F:28])([F:27])[F:26])=[O:7])([CH3:4])([CH3:3])[CH3:2]

参加物

5

反応物 2

HCID 552549(Trifluoromethyl)trimethylsilaneHCID 16732142tert-Butyl-(2S,3R)-3-{[tert-butyl(dimethyl)silyl]oxy}-2-formylpyrrolidine-1-carboxylate

生成物 1

HCID 16732286(2R,3R)-3-(tert-Butyl-dimethylsilanyloxy)-2-[(1R)-(2,2,2-trifluoro-1-hydroxyethyl)]pyrrolidine-1-carboxylic acid tert-butyl ester収率 46.7%

試薬・触媒・溶媒 2

HCID 25953Cesium fluoride触媒HCID 313Hydrochloric Acid溶媒

実験手順

To (2S,3R)-3-(tert-butyldimethylsilanyloxy)-2-formylpyrrolidine-1-carboxylic acid tert-butyl ester (7C) (2.10 g, 6.38 mmol) was added trimethyl(trifluoromethyl)silane (800 μL, 6.57 mmol) and cesium fluoride (dried under high vacuum at 130° C. for 12 h) (10.0 mg, 0.066 mmol). The reaction was stirred at rt for 24 h then heated to 50° C. for 5 h. After cooling to rt, 4N HCl (ca. 10 mL) was added and the reaction was stirred overnight. The brown aqueous solution was decanted and the remaining waxy yellow solid was dried under high vacuum overnight then recrystallized from hexane to provide (2R,3R)-3-(tert-butyldimethylsilanyloxy)-2-[(1R)-(2,2,2-trifluoro-1-hydroxyethyl)]-pyrrolidine-1-carboxylic acid tert-butyl ester (7D) (1.19 g) as a white solid. The mother liquor was concentrated and purified via flash chromatography eluting with 5-20% EtOAc/hexane to provide (2R,3R)-3-(tert-butyldimethylsilanyloxy)-2-[(1S)-(2,2,2-trifluoro-1-hydroxy-ethyl)]-pyrrolidine-1-carboxylic acid tert-butyl ester (7E) (192 mg) as an oil and a mixture of (2R,3R)-3-(tert-butyldimethylsilanyloxy)-2-[(1R)-(2,2,2-trifluoro-1-hydroxy-ethyl)]-pyrrolidine-1-carboxylic acid tert-butyl ester (7D) and starting material (306 mg). The latter was recrystallized from hexane to provide additional (2R,3R)-3-(tert-butyldimethylsilanyloxy)-2-[(1R)-(2,2,2-trifluoro-1-hydroxy-ethyl)]-pyrrolidine-1-carboxylic acid tert-butyl ester (7D) (100 mg).

後処理

  1. temperaturethen heated to 50° C. for 5 h
  2. temperatureAfter cooling to rt
  3. stirringthe reaction was stirred overnight
  4. customThe brown aqueous solution was decanted
  5. customthe remaining waxy yellow solid was dried under high vacuum overnight
  6. customthen recrystallized from hexane

出典と根拠

ORDレコード
ord-2863dee096544a30a47252a518c37939
出典データセット
uspto-grants-2009_12
特許番号
US07625923B2

反応ノート

読み込み中…