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Hydrochloric Acid → Tert-butyl 4-[2-(5-methylene-7-oxo-[1,3]dioxolo[4,5-f]isoindol-6-yl)ethyl]piperidine-1-carboxylate

HRID 528509
Notes
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Reaction equation

HRID 528509 reaction equation
O=[C:2]1[C:10]2[CH:9]=[C:8]3[O:11][CH2:12][O:13][C:7]3=[CH:6][C:5]=2[C:4](=[O:14])[N:3]1[CH2:15][CH2:16][CH:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:19][CH2:18]1.O1CCC[CH2:31]1.C[Mg]I.C(OCC)C.Cl>O.C(OCC)(=O)C>[CH2:31]=[C:2]1[C:10]2[CH:9]=[C:8]3[O:11][CH2:12][O:13][C:7]3=[CH:6][C:5]=2[C:4](=[O:14])[N:3]1[CH2:15][CH2:16][CH:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:27])([CH3:29])[CH3:28])=[O:24])[CH2:19][CH2:18]1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 8028TetrahydrofuranHCID 90064408Tert-butyl 4-[2-(5,7-dioxo-[1,3]dioxolo[4,5-f]isoindol-6-yl) ethyl]piperidine-1-carboxylateHCID 178467823HCID 178467823, compound

Product 1

HCID 90064412Tert-butyl 4-[2-(5-methylene-7-oxo-[1,3]dioxolo[4,5-f]isoindol-6-yl)ethyl]piperidine-1-carboxylateYield 63.8%

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
5 °C

Procedure

To a reaction vessel, 75 g (0.19 mol) compound XI and 500 ml tetrahydrofuran were added while stirring under nitrogen, The mixture was cooled to 0-10° C., 400 ml 1.2N methylmagnesium iodide/ethyl ether solution was slowly added into the reaction vessel, the reaction was kept for 1 h, a minor amount of water was added until there was no bubble formed, concentrated hydrochloric acid was added to adjust the pH to acidic, the reaction was kept for 15 min, 500 ml ethyl acetate and 300 ml water were added, extracted, washed, the organic layer was collected, dried over sodium sulfate, filtered, the filtrate was concentrated to a minor amount, petroleum ether was added, solid was precipitated out, filtered, dried, and 47.6 g compound IX-1 was obtained, with yield of 63.8%. H NMR (DMSO-d6): δ 0.95-1.05 (m, 2H), 1.38 (s, 10H), 1.48 (q, 2H, J=7.0 Hz), 1.71 (d, 2H, J=12.2 Hz), 2.65 (br s, 2H), 3.70 (t, 2H, J=7.2 Hz), 3.90 (d, 2H, J=11.6 Hz), 4.95 (s, 1H), 5.34 (s, 1H), 6.17 (s, 2H), 7.15 (s, 1H), 7.53 (s, 1H); MS (ESI): m/z 423 [M+Na]+.

Workup

  1. customformed
  2. waitwas kept for 15 min
  3. extractionextracted
  4. washwashed
  5. customthe organic layer was collected
  6. dry with materialdried over sodium sulfate
  7. filtrationfiltered
  8. concentrationthe filtrate was concentrated to a minor amount, petroleum ether
  9. additionwas added
  10. customsolid was precipitated out
  11. filtrationfiltered
  12. customdried

Sources & evidence

ORD record
ord-8f3328c0b6c342e5a95c648d44323f52
Source dataset
uspto-grants-2016_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09346818B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes