Methanol → HCID 86619081, compound

HRID 2245753Notes

Reaction equation

HRID 2245753 reaction equation
[CH3:1]/[C:2](/[CH2:8][CH2:9][C:10]1[C:15]([CH3:17])([CH3:16])[CH2:14][CH2:13][CH2:12][C:11]=1[CH3:18])=[CH:3]\[CH2:4][C:5]([OH:7])=[O:6].[CH3:19][O:20][C:21](=[O:30])[C@@H:22]([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)O.CO.C1CCC(N=C=NC2CCCCC2)CC1>CC(OC)(C)C.CN(C1C=CN=CC=1)C>[CH3:19][O:20][C:21]([C@H:22]([O:6][C:5](=[O:7])[CH2:4][CH:3]=[C:2]([CH3:1])[CH2:8][CH2:9][C:10]1[C:15]([CH3:17])([CH3:16])[CH2:14][CH2:13][CH2:12][C:11]=1[CH3:18])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[O:30]

Participants

7

Reactant 4

HCID 887MethanolHCID 10868DicyclohexylcarbodiimideHCID 2724623(R)-(-)-Methyl mandelateHCID 11075899HCID 11075899, compound

Product 1

HCID 86619081HCID 86619081, compoundYield 88%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 15413tert-Butyl methyl etherSolvent2×

Procedure

To a solution of 10.0 g (40 mmol) (E)-4-methyl-6-(2,6,6-trimethyl-cyclohex-1-enyl)-hex-3-enoic acid [H. S. Corey, J. R. D. Cormick, W. E. Swensen, J. Am. Chem. Soc. 1964, 86, 1884] in 100 ml MTBE were added at r.t. 6.64 g (40 mmol) (R)-(−)-mandelic acid methyl ester [α]D=−144.9 (c=1.04, MeOH) and 1.0 g DMAP. Then a solution of 8.24 g (40 mmol) DCC in 100 ml MTBE was added and the reaction mixture stirred for 3 h, filtered and the residue washed with MTBE. The combined organic phases were concentrated in vacuo and the residue (17.6 g) was purified by flash chromatography (250 g silicagel, hexane/MTBE 9:1) affording 12.2 g (88%) 4-methyl-6-(2,6,6-trimethyl-cyclohex-1-enyl)-hex-3-enoic acid (R)-methoxycarbonyl-phenyl-methyl ester (12) in form of a colorless oil.

Workup

  1. filtrationfiltered
  2. washthe residue washed with MTBE
  3. concentrationThe combined organic phases were concentrated in vacuo
  4. customthe residue (17.6 g) was purified by flash chromatography (250 g silicagel, hexane/MTBE 9:1)

Sources & evidence

ORD record
ord-17a6877bcd924a6aa45e1105960777de
Source dataset
uspto-grants-2010_03
Patent number
US07683190B2

Reaction notes

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