Triethylamine → 3'-chloro-4-(1-ethyl-5-methyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl

HRID 220553ノート

反応式

HRID 220553 の反応式
[CH2:1]([N:3]1[C:7]([CH3:8])=[C:6]([CH:9]=O)[CH:5]=[N:4]1)[CH3:2].Cl.Cl.[Cl:13][C:14]1[C:15]([N:20]2[CH2:25][CH2:24][NH:23][CH2:22][CH2:21]2)=[N:16][CH:17]=[CH:18][N:19]=1.C(N(CC)CC)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl.C(O)(=O)C>[Cl:13][C:14]1[C:15]([N:20]2[CH2:21][CH2:22][N:23]([CH2:9][C:6]3[CH:5]=[N:4][N:3]([CH2:1][CH3:2])[C:7]=3[CH3:8])[CH2:24][CH2:25]2)=[N:16][CH:17]=[CH:18][N:19]=1

参加物

7

反応物 4

HCID 8471TriethylamineHCID 5732041-Ethyl-5-methyl-1H-pyrazole-4-carbaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 866416583'-chloro-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl dihydrochloride

生成物 1

HCID 866416643'-chloro-4-(1-ethyl-5-methyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl収率 88.6%

試薬・触媒・溶媒 2

HCID 111,2-Dichloroethane溶媒HCID 176Acetic Acid溶媒

実験手順

Dissolve 1-ethyl-5-methyl-1H-pyrazole-4-carbaldehyde (2.92 g, 21.1 mmol) in 1,2-dichloroethane (184 mL). Add 3′-chloro-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl dihydrochloride (4.97 g, 18.3 mmol), triethylamine (5.9 mL, 42.3 mmol), sodium triacetoxyborohydride (6.72 g, 31.7 mmol) and acetic acid (1.98 mL) and stir at room temperature for 18 hr. Add aq. saturated sodium bicarbonate and extract four times with DCM. Dry combined organic layers (magnesium sulfate), filter, concentrate, and purify (silica gel chromatography, eluting with 50:50 to 100:0 ethyl acetate:hexanes then 10:90 to 20:80 methanol:ethyl acetate) to give 3′-chloro-4-(1-ethyl-5-methyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (5.2 g, 88%). MS (ES): m/z=321 [M+H]+.

後処理

  1. extractionAdd aq. saturated sodium bicarbonate and extract four times with DCM
  2. customDry
  3. filtrationfilter
  4. concentrationconcentrate
  5. custompurify (silica gel chromatography
  6. washeluting with 50:50 to 100:0 ethyl acetate

出典と根拠

ORDレコード
ord-8001cda7f8dd4de2aa89f2d9acdb9526
出典データセット
uspto-grants-2012_06
特許番号
US08202873B2

反応ノート

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