Ammonia → (2R,4R)-1-tert-butyl 2-methyl 4-(3-(4-cyanophenyl)ureido)piperidine-1,2-dicarboxylate

HRID 1685467Notes

Reaction equation

HRID 1685467 reaction equation
[N:1]([C:4]1[CH:11]=[CH:10][C:7]([C:8]#[N:9])=[CH:6][CH:5]=1)=[C:2]=[O:3].[NH2:12][C@@H:13]1[CH2:18][CH2:17][N:16]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C@@H:15]([C:26]([O:28][CH3:29])=[O:27])[CH2:14]1.CCN(CC)CC.N>C1COCC1.CO>[C:8]([C:7]1[CH:10]=[CH:11][C:4]([NH:1][C:2](=[O:3])[NH:12][C@@H:13]2[CH2:18][CH2:17][N:16]([C:19]([O:21][C:22]([CH3:23])([CH3:24])[CH3:25])=[O:20])[C@@H:15]([C:26]([O:28][CH3:29])=[O:27])[CH2:14]2)=[CH:5][CH:6]=1)#[N:9]

Participants

7

Reactant 4

HCID 222AmmoniaHCID 8471TriethylamineHCID 1703804-Cyanophenyl isocyanateHCID 54209755(2R,4R)-1-tert-butyl 2-methyl 4-aminopiperidine-1,2-dicarboxylate

Product 1

HCID 57539094(2R,4R)-1-tert-butyl 2-methyl 4-(3-(4-cyanophenyl)ureido)piperidine-1,2-dicarboxylateYield 93.6%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

4-isocyanatobenzonitrile (1.17 g, 8.13 mmol) was added to a solution of (2R,4R)-1-tert-butyl 2-methyl 4-aminopiperidine-1,2-dicarboxylate (2.0 g, 7.7 mmol) and NEt3 (1.3 mL, 9.3 mmol) in THF (30 mL), and the resulting solution was stirred at room temperature for 6 hours. 1M ammonia in methanol (5 mL) was added to reaction mixture to quench excess isocyanine. Water (100 mL) and ethyl acetate (200 mL) were added to the mixture. The organic layer was separated and dried over MgSO4 and concentrated to give a solid. Purification was done by Companion (ReadySep, 80 g, silica gel packed) with ethyl acetate/heptane from 40-70% to give the urea as a white solid 2.9 g (90%). LC-MS: 403.2, 401.3 (t=2.6 min).

Workup

  1. customto quench excess isocyanine
  2. additionWater (100 mL) and ethyl acetate (200 mL) were added to the mixture
  3. customThe organic layer was separated
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated
  6. customto give a solid
  7. customPurification

Sources & evidence

ORD record
ord-402aa2c149f249c2bd27555ee17c9c81
Source dataset
uspto-grants-2012_04
Patent number
US08148401B2

Reaction notes

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