Trimethyl orthoacetate → (S)-6-(2-Methyl-allyl)-3-{(S)-1-[4-(5-methyl-[1,3,4]oxadiazol-2-yl)-phenyl]-ethyl}-6-phenyl-[1,3]oxazinan-2-one

HRID 473933Notes

Reaction equation

HRID 473933 reaction equation
O[C:2]([CH3:30])([CH3:29])[CH2:3][C@@:4]1([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[O:9][C:8](=[O:10])[N:7]([C@H:11]([C:13]2[CH:22]=[CH:21][C:16]([C:17]([NH:19][NH2:20])=[O:18])=[CH:15][CH:14]=2)[CH3:12])[CH2:6][CH2:5]1.O.[C:32]1(C)C=CC(S(O)(=O)=O)=C[CH:33]=1.COC(OC)(OC)C>C(OCC)(=O)C>[CH3:29][C:2](=[CH2:30])[CH2:3][C@:4]1([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[O:9][C:8](=[O:10])[N:7]([C@H:11]([C:13]2[CH:22]=[CH:21][C:16]([C:17]3[O:18][C:32]([CH3:33])=[N:20][N:19]=3)=[CH:15][CH:14]=2)[CH3:12])[CH2:6][CH2:5]1

Participants

5

Reactant 3

HCID 15050Trimethyl orthoacetateHCID 521998p-Toluenesulfonic acid monohydrateHCID 668580744-{(S)-1-[(S)-6-(2-Hydroxy-2-methyl-propyl)-2-oxo-6-phenyl-[1,3]oxazinan-3-yl]-ethyl}-benzoic acid hydrazide

Product 1

HCID 66857751(S)-6-(2-Methyl-allyl)-3-{(S)-1-[4-(5-methyl-[1,3,4]oxadiazol-2-yl)-phenyl]-ethyl}-6-phenyl-[1,3]oxazinan-2-one

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of 4-{(S)-1-[(S)-6-(2-hydroxy-2-methyl-propyl)-2-oxo-6-phenyl-[1,3]oxazinan-3-yl]-ethyl}-benzoic acid hydrazide (90 mg), toluene-4-sulfonic acid monohydrate (10 mg), and 1,1,1-trimethoxy-ethane (1 ml) was stirred at room temperature for 1 h, at 80° C. for 2 h, and finally at reflux temperature for 1.5 h. After cooling to ambient temperature, ethyl acetate was added and the resulting mixture was washed with aqueous NaHCO3 solution and brine. The solvent was removed under reduced pressure and the residue was purified by chromatography on silica gel (CH2Cl2/MeOH 99:1->95:5) to afford the title compound in a mixture with the double bond isomer (S)-6-(2-methyl-allyl)-3-{(S)-1-[4-(5-methyl-[1,3,4]oxadiazol-2-yl)-phenyl]-ethyl}-6-phenyl-[1,3]oxazinan-2-one (ca. 64:36) as a colorless resin-like solid.

Workup

  1. temperaturefinally at reflux temperature for 1.5 h
  2. temperatureAfter cooling to ambient temperature
  3. washthe resulting mixture was washed with aqueous NaHCO3 solution and brine
  4. customThe solvent was removed under reduced pressure
  5. customthe residue was purified by chromatography on silica gel (CH2Cl2/MeOH 99:1->95:5)

Sources & evidence

ORD record
ord-78b2ba7f196b4a03b4be76e9c59e2921
Source dataset
uspto-grants-2014_01
Patent number
US08637505B2

Reaction notes

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