Triethylamine → 5-[3-chloro-4-(methylsulfonyl)phenyl]-6-[(2R,3R,7R)-2,3-diphenyl-1,4-dioxaspiro[4.4]non-7-yl]-1-(pyrazin-2-yl)hexane-1,4-dione

HRID 1881913Notes

Reaction equation

HRID 1881913 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:12]([CH2:17][C@H:18]2[CH2:38][CH2:37][C:20]3([O:24][C@H:23]([C:25]4[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=4)[C@@H:22]([C:31]4[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=4)[O:21]3)[CH2:19]2)[C:13](=[O:16])[CH:14]=[CH2:15])[CH:5]=[CH:6][C:7]=1[S:8]([CH3:11])(=[O:10])=[O:9].[N:39]1[CH:44]=[CH:43][N:42]=[CH:41][C:40]=1[CH:45]=[O:46].C(N(CC)CC)C>C(O)C.[Cl-].C([N+]1C(C)=C(CCO)SC=1)C1C=CC=CC=1.C(OCC)(=O)C>[Cl:1][C:2]1[CH:3]=[C:4]([CH:12]([CH2:17][C@H:18]2[CH2:38][CH2:37][C:20]3([O:21][C@H:22]([C:31]4[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=4)[C@@H:23]([C:25]4[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=4)[O:24]3)[CH2:19]2)[C:13](=[O:16])[CH2:14][CH2:15][C:45]([C:40]2[CH:41]=[N:42][CH:43]=[CH:44][N:39]=2)=[O:46])[CH:5]=[CH:6][C:7]=1[S:8]([CH3:11])(=[O:9])=[O:10]

Participants

7

Reactant 3

HCID 8471TriethylamineHCID 11274980Pyrazine-2-carbaldehydeHCID 59331594HCID 59331594, compound

Product 1

HCID 593312455-[3-chloro-4-(methylsulfonyl)phenyl]-6-[(2R,3R,7R)-2,3-diphenyl-1,4-dioxaspiro[4.4]non-7-yl]-1-(pyrazin-2-yl)hexane-1,4-dioneYield 44%

Reagents, catalysts & solvents 3

HCID 28333523-Benzyl-5-(2-hydroxyethyl)-4-methylthiazolium chlorideCatalystHCID 702EthanolSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 4-[3-chloro-4-(methylsulfonyl)phenyl]-5-[(2R,3R,7R)-2,3-diphenyl-1,4-dioxaspiro[4.4]non-7-yl]pent-1-en-3-one (539 mg) in ethanol (5 mL) were added pyrazine-2-carbaldehyde (126 mg), 3-benzyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazol-3-ium chloride (29.0 mg) and triethylamine (59 μL), and the mixture was stirred with heating under reflux for 1 hr. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate and washed with water. The ethyl acetate layer was dried (MgSO4) and concentrated. The residue was subjected to silica gel column chromatography, and the title compound (284 mg, yield 44%) was obtained as a pale-yellow amorphous solid from a fraction eluted with ethyl acetate-hexane (2:1, volume ratio).

Workup

  1. temperaturewith heating
  2. temperatureunder reflux for 1 hr
  3. washwashed with water
  4. dry with materialThe ethyl acetate layer was dried (MgSO4)
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-e4f180dd45de41349c4965d7f28e414c
Source dataset
uspto-grants-2012_11
Patent number
US08318746B2

Reaction notes

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