2,6-Lutidine → methyl [(3R,4R)-3-benzyloxycarbonylamino-4-allyl-2-oxoazetidin-1-yl]-3-methylbut-2-enoate

HRID 235729Notes

Reaction equation

[NH2:1][C@@H:2]1[C@@H:5]([CH2:6][CH:7]=[CH2:8])[N:4]([C:9](=[C:14]([CH3:16])[CH3:15])[C:10]([O:12][CH3:13])=[O:11])[C:3]1=[O:17].N1C(C)=CC=CC=1C.Cl[C:27]([O:29][CH2:30][C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)=[O:28]>C(Cl)Cl.C(OCC)(=O)C>[CH2:30]([O:29][C:27]([NH:1][C@@H:2]1[C@@H:5]([CH2:6][CH:7]=[CH2:8])[N:4]([C:9](=[C:14]([CH3:16])[CH3:15])[C:10]([O:12][CH3:13])=[O:11])[C:3]1=[O:17])=[O:28])[C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of methyl [(3R,4R)-3-amino-4-allyl-2-oxoazetidin-1-yl]-3-methylbut-2-enoate (7.0 g) in methylene chloride (110 ml) were added 2,6-lutidine (4.11 ml) and benzyl chloroformate (5.03 ml) at 0° C. and the mixture was stirred for 30 minutes at 0° C. The reaction mixture was diluted with ethyl acetate (800 ml) and the solution was washed with diluted hydrochloric acid, brine, aqueous saturated sodium bicarbonate, and brine. The organic layer was dried over magnesium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel (200 g) eluting with a mixture of methylene chloride and ethyl acetate (20:1-4:1) to give methyl [(3R,4R)-3-benzyloxycarbonylamino-4-allyl-2-oxoazetidin-1-yl]-3-methylbut-2-enoate (10.7 g) as an oil.

Workup

washthe solution was washed with diluted hydrochloric acid, brine, aqueous saturated sodium bicarbonate, and brine
dry with materialThe organic layer was dried over magnesium sulfate
customevaporated in vacuo
customThe residue was chromatographed on silica gel (200 g)
washeluting with a mixture of methylene chloride and ethyl acetate (20:1-4:1)

Sources & evidence

ORD record: ord-62156a324e2c4dd8a7de835bda77096a
Source dataset: uspto-grants-1987_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04640915

Reaction notes

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