Dicyclohexylcarbodiimide → (S)alpha-cyano-3-phenoxy-benzyl (1R,cis) 2,2dimethyl-3-[3-oxo-3-ethoxyethoxy-1-propynyl]-cyclopropane-carboxylate

HRID 1639435Notes

Reaction equation

HRID 1639435 reaction equation
[CH3:1][C:2]1([CH3:29])[C@@H:4]([C:5]#[C:6][C:7]([OH:9])=[O:8])[C@H:3]1[C:10]([O:12][C@H:13]([C:27]#[N:28])[C:14]1[CH:19]=[CH:18][CH:17]=[C:16]([O:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH:15]=1)=[O:11].[CH2:30]([O:32][CH:33](O)[CH3:34])[CH3:31].C1(N=C=NC2CCCCC2)CCCCC1>CN(C)C1C=CN=CC=1.C(Cl)Cl>[CH3:1][C:2]1([CH3:29])[C@@H:4]([C:5]#[C:6][C:7](=[O:9])[O:8][CH2:31][CH2:30][O:32][CH2:33][CH3:34])[C@H:3]1[C:10]([O:12][C@H:13]([C:27]#[N:28])[C:14]1[CH:19]=[CH:18][CH:17]=[C:16]([O:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH:15]=1)=[O:11]

Participants

6

Reactant 3

HCID 10868DicyclohexylcarbodiimideHCID 101298981-EthoxyethanolHCID 13093796(S)alpha-cyano-3-phenoxy-benzyl (IR,cis) 2,2-dimethyl-3-(2-carboxyethynyl)-cyclopropane-carboxylate

Product 1

HCID 54466126(S)alpha-cyano-3-phenoxy-benzyl (1R,cis) 2,2dimethyl-3-[3-oxo-3-ethoxyethoxy-1-propynyl]-cyclopropane-carboxylate

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent2×

Procedure

A mixture of 2 g of (S)α-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3-[3-hydroxy-3-oxo-1-propynyl]-cyclopropane-carboxylate, 20 ml of methylene chloride and 0.7 ml of ethoxyethanol cooled to 0 to +5° C. was admixed with a mixture of 1.1 g of dicyclohexylcarbodiimide, 5 ml of methylene chloride and 15 mg of 4-dimethylamino-pyridine and the mixture was stirred for 1 hour at +5° C. and for 2 hours at room temperature and was filtered. The filtrate was evaporated to dryness and the residue was chromatographed over silica gel and eluted with a 3-1 mixture of cyclohexane-ethyl acetate to obtain 1.3 g of (S)α-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3-[3-oxo-3-ethoxyethoxy-1-propynyl]-cyclopropane-carboxylate.

Workup

  1. temperaturecooled to 0 to +5° C.
  2. filtrationwas filtered
  3. customThe filtrate was evaporated to dryness
  4. customthe residue was chromatographed over silica gel
  5. washeluted with a 3-1 mixture of cyclohexane-ethyl acetate

Sources & evidence

ORD record
ord-2d52347fb2a34e48ad962192d5f7f2d3
Source dataset
uspto-grants-1989_11
Patent number
US04883806

Reaction notes

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