Hydrochloric Acid → Benzyl (3S)-3-(4-morpholinylmethyl)-3,4-dihydro-2(1H)-isoquinolinecarboxylate

HRID 2272871Notes

Reaction equation

HRID 2272871 reaction equation
[N:1]1([C:7]([C@@H:9]2[CH2:18][C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[CH2:11][N:10]2[C:19]([O:21][CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)=[O:20])=O)[CH2:6][CH2:5][O:4][CH2:3][CH2:2]1.Cl.C([O-])(O)=O.[Na+]>O1CCCC1>[N:1]1([CH2:7][C@@H:9]2[CH2:18][C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[CH2:11][N:10]2[C:19]([O:21][CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)=[O:20])[CH2:6][CH2:5][O:4][CH2:3][CH2:2]1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 516892Sodium BicarbonateHCID 1118330Benzyl (3S)-3-(4-morpholinylcarbonyl)-3,4-dihydro-2(1H)-isoquinoline carboxylate

Product 1

HCID 118482909Benzyl (3S)-3-(4-morpholinylmethyl)-3,4-dihydro-2(1H)-isoquinolinecarboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
80 °C

Procedure

To a solution of 5.3 g of the product obtained in Step A (13.9 mmol) in 278 mL of tetrahydrofuran there are added 14 mL of BH3Me2S (27.8 mmol) at ambient temperature. The whole is heated for 4 hours at 80° C. It is allowed to return to ambient temperature, and then there are added 7 mL (14 mmol) of BH3Me2S. The reaction mixture is again heated at 80° C. for 2 hours. The tetrahydrofuran is subsequently evaporated off, and there are then added slowly methanol and then 5.6 mL of 5N hydrochloric acid (27.8 mmol). The mixture is stirred at ambient temperature overnight and then at 80° C. for one hour. There is subsequently added a saturated NaHCO3 solution to the reaction mixture at 0° C. until a pH of 8 is reached, and then extraction with ethyl acetate is carried out. The organic phase is subsequently dried over magnesium sulphate and then filtered and evaporated to dryness. The title product is obtained in the form of an oil.

Workup

  1. customto return to ambient temperature
  2. additionthere are added 7 mL (14 mmol) of BH3Me2S
  3. temperatureThe reaction mixture is again heated at 80° C. for 2 hours
  4. customThe tetrahydrofuran is subsequently evaporated off
  5. additionthere are then added slowly methanol
  6. waitat 80° C. for one hour
  7. extractionextraction with ethyl acetate
  8. dry with materialThe organic phase is subsequently dried over magnesium sulphate
  9. filtrationfiltered
  10. customevaporated to dryness

Sources & evidence

ORD record
ord-ae8f8b6e65634424b1736610111f2558
Source dataset
uspto-grants-2015_09
Patent number
US09120791B2

Reaction notes

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