2-Methyl-3-butyn-2-ol → 5-(2-Hydroxy-2-methyl-3-butynyl)-3-(1-tert-butyloxycarbonyl-2-pyrrolidinyl)pyridine

HRID 1042

反応式

HRID 1042 の反応式
Br[C:2]1[CH:3]=[C:4]([CH:8]2[CH2:12][CH2:11][CH2:10][N:9]2[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH:5]=[N:6][CH:7]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[K+].[K+].[CH3:45][C:46]([OH:50])([C:48]#[CH:49])[CH3:47]>[Pd].COCCOC.O.[Cu]I.C(OCC)(=O)C>[OH:50][C:46]([CH3:47])([C:48]#[CH:49])[CH2:45][C:2]1[CH:3]=[C:4]([CH:8]2[CH2:12][CH2:11][CH2:10][N:9]2[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH:5]=[N:6][CH:7]=1

参加物

10

反応物 4

HCID 82582-Methyl-3-butyn-2-olHCID 11430Potassium CarbonateHCID 11776TriphenylphosphineHCID 19694337Tert-butyl 2-(5-bromopyridin-3-yl)pyrrolidine-1-carboxylate

生成物 1

HCID 196943235-(2-Hydroxy-2-methyl-3-butynyl)-3-(1-tert-butyloxycarbonyl-2-pyrrolidinyl)pyridine収率 76.4%

試薬・触媒・溶媒 5

HCID 23938Palladium触媒HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)触媒HCID 962Water溶媒2 回HCID 80711,2-Dimethoxyethane溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
25 °C

実験手順

A mixture of 5-bromo-3-(1-tert-butyloxycarbonyl-2-pyrrolidinyl)pyridine (1 g, 3.06 mmol), 10% palladium on charcoal (80 mg, 0.077 mmol), copper(I)iodide (58 mg, 0.30 mmol), triphenylphosphine (80 mg, 0.30 mmol) and potassium carbonate (1.06 g, 7.65 mmol) in DME (5 mL) and water (5 mL) was stirred at 25° C. After 0.75 h 2-methyl-3-butyn-2-ol (0.74 mL, 7.65 mmol) was added and the reaction flask was heated at 80° C. for 18 h. Water (30 mL) and ethyl acetate (30 mL) were added to the cooled mixture and this was filtered through celite. The organic phase was separated and the aqueous layer extracted with ethyl acetate (3×20 mL) and the combined ethyl acetate extracts were washed with brine (20 mL), dried (MgSO4) and concentrated in vacuo. The crude product was purified by silica gel column chromatography with ethyl acetate:hexane (1:3 to 1:1) as eluants to afford 5-(2-hydroxy-2-methyl-3-butynyl)-3-(1-tert-butyloxycarbonyl-2-pyrrolidinyl)pyridine as an oil (772 mg, 76%). LRMS (EI) m/e 231 (M+ +H --CO2 and isobutylene), 230 (M+ --CO2 and isobutylene), 229 (M+ --CO2 tBu); 1H NMR (CDCl3, 300 MHz): δ 8.56 (b-s, 1H), 8.37 (b-d, J=1.5 Hz, 1H), 7.53 (m, 1H), 4.93 (b-m, 0.5H), 4.76 (b-m, 0.5H), 3.5-3.7 (b-m, 2H), 2.36 (m, 1H), 1.75-2.0 (b-m, 3H), 1.72 (b-s, 1H), 1.63 (s, 6H), 1.45 (b-s, 3H), 1.21 (b-s, 6H).

後処理

  1. temperaturethe reaction flask was heated at 80° C. for 18 h
  2. filtrationthis was filtered through celite
  3. customThe organic phase was separated
  4. extractionthe aqueous layer extracted with ethyl acetate (3×20 mL)
  5. washthe combined ethyl acetate extracts were washed with brine (20 mL)
  6. dry with materialdried (MgSO4)
  7. concentrationconcentrated in vacuo
  8. customThe crude product was purified by silica gel column chromatography with ethyl acetate:hexane (1:3 to 1:1) as eluants

出典と根拠

ORDレコード
ord-9501c188203f4630b6447cbfdf010c16
出典データセット
uspto-grants-1998_03
特許番号
US05723477

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