Hydrochloric Acid → methyl 3-methyl-2-[(3S,4R)-3-methyl-2-oxo-4-allylazetidin-1-yl]but-2-enoate

HRID 851392ノート

反応式

HRID 851392 の反応式
[CH:1](NC1CCCCC1)(C)C.[CH3:11][C:12]([CH3:26])=[C:13]([N:18]1[C@H:21]([CH2:22][CH:23]=[CH2:24])[CH2:20][C:19]1=[O:25])[C:14]([O:16][CH3:17])=[O:15].Cl>O1CCCC1.C(OCC)(=O)C>[CH3:11][C:12]([CH3:26])=[C:13]([N:18]1[C@H:21]([CH2:22][CH:23]=[CH2:24])[C@H:20]([CH3:1])[C:19]1=[O:25])[C:14]([O:16][CH3:17])=[O:15]

参加物

6

反応物 3

HCID 313Hydrochloric AcidHCID 62386CyclohexylisopropylamineHCID 54326273methyl 2-[(4R)-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoate

生成物 1

HCID 56629339methyl 3-methyl-2-[(3S,4R)-3-methyl-2-oxo-4-allylazetidin-1-yl]but-2-enoate

試薬・触媒・溶媒 2

HCID 8028Tetrahydrofuran溶媒2 回HCID 8857Ethyl Acetate溶媒

反応条件

温度
-70 °C

実験手順

1.55 M Butyl lithium-hexane solution (1.66 ml) was added to a solution of N-isopropylcyclohexylamine (0.29 ml) in tetrahydrofuran (3 ml) at -70° C., and the mixture was stirred for 20 minutes at -70° C. and allowed to warm up to 0° C. This mixture was added to a solution of methyl 3-methyl-2-[(4R)-2-oxo-4-allylazetidin-1-yl]but-2-enoate (100 mg) in tetrahydrofuran (3 ml) at -70° C., and the mixture was stirred for 1 hour at -70° C. and allowed to warm up to -30° C. during 30 minutes. 1 N Hydrochloric acid (3.6 ml) was added to the reaction mixture at -70° C., and the mixture was diluted with ethyl acetate (30 ml). The solution was washed with water and brine, dried over magnesium sulfate, and evaporated in vacuo. The residue was chromatographed on silica gel eluting with a mixture of hexane and ethyl acetate (5:1-2:1) to give methyl 3-methyl-2-[(3S,4R)-3-methyl-2-oxo-4-allylazetidin-1-yl]but-2-enoate (20 mg); IR (CH2Cl2): 1740, 1715 cm-1 ; NMR (CDCl3) δ: 1.23 (d, 3H, J=8 Hz), 1.95 (s, 3H), 2.19 (s, 3H), 1.36 (t, 2H, J=7 Hz), 3.36 (dq, 1H, J=6, 8 Hz), 3.75 (s, 3H), 4.04 (dt, 1H, J=6, 7 Hz), 4.9-5.2 (m, 2H), 5.4-5.9 (m, 2H); and methyl 3-methyl-2-[(3R,4R)-3-methyl-2-oxo-4-allylazetidin-1-yl]but-3-enoate (28 mg); IR (CH2Cl2): 1740 cm-1 ; NMR (CDCl3) δ: 1.27 and 1.29 (a pair of d, 3H, J=8 Hz), 1.83 (broad s, 3H), 2.1-2.9 (m, 2H), 2.85 (dq, 1H, J=2, 8 Hz), 3.2-3.4 (m, 1H), 3.74 and 3.76 (a pair of s, 3H), 4.8-5.2 (m, 5H), 5.5-6.0 (m, 1H); and a mixture of methyl 3-methyl-2-[(3R,4R)-3-methyl-2-oxo- 4-allylazetidin-1-yl]but-2-enoate and methyl 3-methyl-2-[(3S,4R)-3-methyl-2-oxo-4-allylazetidin-1-yl]but-3-enoate (36 mg): IR (CH2Cl2): 1740 cm-1.

後処理

  1. temperatureto warm up to 0° C
  2. stirringthe mixture was stirred for 1 hour at -70° C.
  3. temperatureto warm up to -30° C. during 30 minutes
  4. washThe solution was washed with water and brine
  5. dry with materialdried over magnesium sulfate
  6. customevaporated in vacuo
  7. customThe residue was chromatographed on silica gel eluting with a mixture of hexane and ethyl acetate (5:1-2:1)

出典と根拠

ORDレコード
ord-a0ce475993454445af1524b6e61a5e57
出典データセット
uspto-grants-1983_05
特許番号
US04383945

反応ノート

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