Triethylamine → Tert-butyl 4-(4-cyano-3-nitrophenyl)piperazine-1-carboxylate

HRID 1406616

反応式

HRID 1406616 の反応式
Br[C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[C:4]([N+:10]([O-:12])=[O:11])[CH:3]=1.Cl.[C:14]([N:21]1[CH2:26][CH2:25][NH:24][CH2:23][CH2:22]1)([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15].CCN(CC)CC>CN(C=O)C>[C:6]([C:5]1[CH:8]=[CH:9][C:2]([N:24]2[CH2:23][CH2:22][N:21]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:26][CH2:25]2)=[CH:3][C:4]=1[N+:10]([O-:12])=[O:11])#[N:7]

参加物

5

反応物 3

HCID 8471TriethylamineHCID 2925354-Bromo-2-nitrobenzonitrileHCID 2755973Tert-butyl Piperazine-1-carboxylate Hydrochloride

生成物 1

HCID 51354044Tert-butyl 4-(4-cyano-3-nitrophenyl)piperazine-1-carboxylate収率 97%

試薬・触媒・溶媒 1

HCID 6228Dimethylformamide溶媒

反応条件

温度
70 °C

実験手順

To a solution of a mixture of compound 17 (3 g, 13.27 mmol) and 1-boc-piperazine hydrochloride (3.53 g, 15.92 mmol) in DMF (30 mL) was added Et3N (4.4 mL, 31.8 mmol), and the mixture was heated at 70° C. for 6 h. The mixture was cooled to room temperature, extracted with ethyl acetate (100 mL), and the organic layer was washed with brine (20 mL), dried over Na2SO4 and evaporated. Trituration with diethyl ether afforded 4.27 g (97%) of compound 18 as bright yellow solid, m.p. 138-139° C.; IR (KBr) νmax. cm−1: 3042 (Ar—H), 2252 (CN), 1690 (C═O), 1610, 1520, 1412 (C═C). 1H NMR (500 MHz, DMSO-d6) δ=1.39 (s, 9H, (CH3)3C); 3.44 (br. s, 4H, 2 CH2); 7.19 (dd, 1H, J=2.6, 9.4 Hz, H-5); 7.46 (d, 1H, J=2.7 Hz, H-2); 8.17 (d, 1H, J=2.7 Hz, H-6); 13C NMR (125.7 MHz, DMSO-d) δ=28.11 (CH3)3C), 45.92 (CH2), 46.02 (CH2), 79.56 (CH3)3C), 109.24 (C-4), 115.61 (C-2), 116.46 (CN), 119.03 (C-6), 128.09 (C-5), 135.85 (C-3), 153.30 (C-1), 154.13 (C═O). Calculated (%) for C16H20N4O4(332.15); C, 57.82; H, 6.07; N, 16.86. found (%); C, 57.76; H, 6.11; N, 16.80.

後処理

  1. temperatureThe mixture was cooled to room temperature
  2. extractionextracted with ethyl acetate (100 mL)
  3. washthe organic layer was washed with brine (20 mL)
  4. dry with materialdried over Na2SO4
  5. customevaporated

出典と根拠

ORDレコード
ord-6a61e8eb816e44bfa19c5d645d52f943
出典データセット
uspto-grants-2014_12
特許番号
US08916704B1

関連ノート

読み込み中…