Hydrochloric Acid → Benzyl 4-(4-methoxycarbonylphenyl)-3-[4-(3-methoxypropyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate

HRID 1176540Notes

Reaction equation

HRID 1176540 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([CH:11]2[CH2:16][CH2:15][N:14]([C:17]([O:19][CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[O:18])[CH2:13][CH:12]2[O:27][CH2:28][C:29]2[CH:30]=[CH:31][C:32]3[O:37][CH2:36][C:35](=O)[N:34]([CH2:39][CH2:40][CH2:41][O:42][CH3:43])[C:33]=3[CH:44]=2)=[CH:7][CH:6]=1)=[O:4].[BH4-].C([N+](CCCC)(CCCC)CCCC)CCC.Cl.C(=O)([O-])O.[Na+]>C(Cl)(Cl)Cl.O>[CH3:1][O:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([CH:11]2[CH2:16][CH2:15][N:14]([C:17]([O:19][CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[O:18])[CH2:13][CH:12]2[O:27][CH2:28][C:29]2[CH:30]=[CH:31][C:32]3[O:37][CH2:36][CH2:35][N:34]([CH2:39][CH2:40][CH2:41][O:42][CH3:43])[C:33]=3[CH:44]=2)=[CH:7][CH:6]=1)=[O:4]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 169536Tetrabutylammonium borohydrideHCID 516892Sodium BicarbonateHCID 68500724benzyl 4-(4-methoxycarbonylphenyl)-3-[4-(3-methoxypropyl)-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate

Product 1

HCID 68501193Benzyl 4-(4-methoxycarbonylphenyl)-3-[4-(3-methoxypropyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6212ChloroformSolvent

Conditions

Temperature
60 °C

Procedure

A solution of 3.92 g of benzyl 4-(4-methoxycarbonylphenyl)-3-[4-(3-methoxypropyl)-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate (Example 255d) in 50 ml of chloroform is admixed under argon with 4.27 g of tetrabutylammonium borohydride. The reaction solution is stirred at 60° C. over 19 hours and subsequently cooled to room temperature. 10 ml of 2N HCl and 50 ml of water are subsequently added dropwise. The suspension is stirred at room temperature over 10 minutes. The reaction mixture is poured onto 150 ml of aqueous sodium hydrogencarbonate solution and extracted with 800 ml of tert-butyl methyl ether. The organic phase is washed with 100 ml of water and 50 ml of brine, dried over sodium sulphate, filtered and concentrated by evaporation. The title compound is obtained as a colourless oil from the residue by means of flash chromatography (SiO2 60F). Rf=0.19 (2:1 EtOAc-heptane); Rt=5.34.

Workup

  1. temperaturesubsequently cooled to room temperature
  2. stirringThe suspension is stirred at room temperature over 10 minutes
  3. extractionextracted with 800 ml of tert-butyl methyl ether
  4. washThe organic phase is washed with 100 ml of water and 50 ml of brine
  5. dry with materialdried over sodium sulphate
  6. filtrationfiltered
  7. concentrationconcentrated by evaporation

Sources & evidence

ORD record
ord-df64806985af4b16a45a547f80ac569e
Source dataset
uspto-grants-2010_11
Patent number
US07842688B2

Reaction notes

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