N,N,N',N'-Tetramethylethylenediamine → tert-butyl 3-(2-chloro-9-methyl-6-morpholino-9H-purin-8-yl)-3-hydroxypiperidine-1-carboxylate

HRID 1923203Notes

Reaction equation

HRID 1923203 reaction equation
[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[CH:7][N:8]2[CH3:11])=[C:4]([N:12]2[CH2:17][CH2:16][O:15][CH2:14][CH2:13]2)[N:3]=1.CN(C)CCN(C)C.C([Li])CCC.[O:31]=[C:32]1[CH2:37][CH2:36][CH2:35][N:34]([C:38]([O:40][C:41]([CH3:44])([CH3:43])[CH3:42])=[O:39])[CH2:33]1>O1CCCC1>[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[C:7]([C:32]3([OH:31])[CH2:37][CH2:36][CH2:35][N:34]([C:38]([O:40][C:41]([CH3:43])([CH3:42])[CH3:44])=[O:39])[CH2:33]3)[N:8]2[CH3:11])=[C:4]([N:12]2[CH2:17][CH2:16][O:15][CH2:14][CH2:13]2)[N:3]=1

Participants

6

Reactant 4

HCID 8037N,N,N',N'-TetramethylethylenediamineHCID 2756825Tert-butyl 3-oxopiperidine-1-carboxylateHCID 715006872-Chloro-9-methyl-6-(4-morpholinyl)-9H-purineHCID 178418339Butyllithium

Product 1

HCID 59605825tert-butyl 3-(2-chloro-9-methyl-6-morpholino-9H-purin-8-yl)-3-hydroxypiperidine-1-carboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Conditions

Temperature
-78 °C

Procedure

To a stirred solution of 4-(2-chloro-9-methyl-9H-purin-6-yl)morpholine (5.0 g) and N,N,N′,N′-tetramethylethylenediamine (4.46 mL) in tetrahydrofuran (80 mL) at −78° C. was added 2.5 M of n-Butyllithium in THF (17 mL). The solution was stirred at −78° C. for 15 mins then the temp was raised to −40° C. until the solution became clear and dark red (indicating full lithiation). The solution was lowered back to −78° C. and tert-butyl 3-oxopiperidine-1-carboxylate (8.64 g) in 10 mL THF was added slowly over 5 minutes and stirred for 1.5 hrs then quenched with water. The reaction mixture was diluted with ethyl acetate and extracted with a saturated ammonium chloride solution. The organic layer was dried, filtered and concentrated. Any remaining starting material was removed by trituration with hot ether to afford the crude product tert-butyl 3-(2-chloro-9-methyl-6-morpholino-9H-purin-8-yl)-3-hydroxypiperidine-1-carboxylate as an orange oil in quantitative yield.

Workup

  1. temperaturethe temp was raised to −40° C. until the solution
  2. customwas lowered back to −78° C.
  3. stirringstirred for 1.5 hrs
  4. customthen quenched with water
  5. additionThe reaction mixture was diluted with ethyl acetate
  6. extractionextracted with a saturated ammonium chloride solution
  7. customThe organic layer was dried
  8. filtrationfiltered
  9. concentrationconcentrated
  10. customwas removed by trituration with hot ether

Sources & evidence

ORD record
ord-c8e9e5b998524135aed463b58ef009de
Source dataset
uspto-grants-2012_05
Patent number
US08173650B2

Reaction notes

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