Water → tert-butyl 8-carbamoyl-6-chloro-7-phenyl-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate

HRID 589866

反応式

HRID 589866 の反応式
Br[C:2]1[C:3]([C:19](=[O:21])[NH2:20])=[C:4]2[CH2:9][N:8]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:7][CH2:6][N:5]2[C:17]=1[Cl:18].[C:22]1(B(O)O)[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.O.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].ClCCl>[C:19]([C:3]1[C:2]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)=[C:17]([Cl:18])[N:5]2[CH2:6][CH2:7][N:8]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:9][C:4]=12)(=[O:21])[NH2:20]

参加物

8

反応物 4

HCID 962WaterHCID 10796Cesium carbonateHCID 66827Phenylboronic AcidHCID 66585083tert-butyl 7-bromo-8-carbamoyl-6-chloro-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate

生成物 1

HCID 66584861tert-butyl 8-carbamoyl-6-chloro-7-phenyl-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate収率 40%

試薬・触媒・溶媒 3

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)触媒HCID 6344Dichloromethane溶媒HCID 8028Tetrahydrofuran溶媒

反応条件

温度
100 °C

実験手順

To a solution under nitrogen of 3.78 g (9.98 mmol) of tert-butyl 7-bromo-8-carbamoyl-6-chloro-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate in 160 ml of tetrahydrofuran are added 1.34 g (11.0 mmol) of benzeneboronic acid (CAS 98-80-6), 8 ml of water, 9.76 g (30.0 mmol) of caesium carbonate and 0.98 g (1.20 mmol) of a complex of 1,1′-bis(diphenylphosphino)ferrocenedichloropalladium (II) and dichloromethane (PdCl2(dppf).CH2Cl2—CAS 95464-05-4). The mixture is stirred for 6 hours at 100° C. and then for 15 hours at 80° C., then cooled to room temperature and filtered through Celite™. The Celite is rinsed with 100 ml of ethyl acetate and 30 ml of water are added to the combined filtrates. The organic phase is separated out by settling, dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue obtained is chromatographed on a column of silica gel, eluting with a mixture of 5 to 50% ethyl acetate in dichloromethane, to give 1.50 g of tert-butyl 8-carbamoyl-6-chloro-7-phenyl-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate in the form of a white solid after recrystallization from ethyl acetate and drying at 60° C. under reduced pressure.

後処理

  1. waitfor 15 hours at 80° C.
  2. temperaturecooled to room temperature
  3. filtrationfiltered through Celite™
  4. washThe Celite is rinsed with 100 ml of ethyl acetate and 30 ml of water
  5. additionare added to the combined filtrates
  6. customThe organic phase is separated out
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated under reduced pressure
  10. customThe residue obtained
  11. customis chromatographed on a column of silica gel
  12. washeluting with a mixture of 5 to 50% ethyl acetate in dichloromethane

出典と根拠

ORDレコード
ord-cbf55187fc2a44b1971d5c46724696d4
出典データセット
uspto-grants-2016_01
特許番号
US09233965B2

関連ノート

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