Diethyl (ethoxymethylene)malonate → Diethyl [1-ethoxy-2-(6-mesitylpyridin-2-yl)-3-oxohexyl]malonate

HRID 598111Notes

Reaction equation

C(NC(C)C)(C)C.C([Li])CCC.[C:13]1([CH3:33])[CH:18]=[C:17]([CH3:19])[CH:16]=[C:15]([CH3:20])[C:14]=1[C:21]1[N:26]=[C:25]([CH2:27][C:28](=[O:32])[CH2:29][CH2:30][CH3:31])[CH:24]=[CH:23][CH:22]=1.[CH3:34][CH2:35][O:36][CH:37]=[C:38]([C:44]([O:46][CH2:47][CH3:48])=[O:45])[C:39]([O:41][CH2:42][CH3:43])=[O:40]>O1CCCC1>[CH2:35]([O:36][CH:37]([CH:38]([C:39]([O:41][CH2:42][CH3:43])=[O:40])[C:44]([O:46][CH2:47][CH3:48])=[O:45])[CH:27]([C:25]1[CH:24]=[CH:23][CH:22]=[C:21]([C:14]2[C:15]([CH3:20])=[CH:16][C:17]([CH3:19])=[CH:18][C:13]=2[CH3:33])[N:26]=1)[C:28](=[O:32])[CH2:29][CH2:30][CH3:31])[CH3:34]

Participants

Conditions

Temperature: -78 °C

Procedure

Diisopropyl amine (0.16 mL, 1.13 mmol) was dissolved in tetrahydrofuran (2 mL). n-Butyllithium (2.5M, 0.45 mL, 1.13 mmol) was added at 0° C. and the reaction stirred for 0.5 h. The solution was cooled to −78° C. and 1-(6-mesityl-pyridin-2-yl)-pentan-2-one (0.29 g, 1.0 mmol) was added. After 0.5 h, ethyl ethoxymethylene malonate (0.21 mL, 1.0 mmol) was added and the reaction was warmed to room temperature. The solution was quenched with water, extracted with ethyl acetate, dried, and concentrated. Flash chromatography (10%-20% ethyl acetate/hexanes) gave the title compound as a mixture of two isomers.

Workup

waitAfter 0.5 h
temperaturethe reaction was warmed to room temperature
customThe solution was quenched with water
extractionextracted with ethyl acetate
customdried
concentrationconcentrated

Sources & evidence

ORD record: ord-c85721d5e3364b6eaca24aefab935b67
Source dataset: uspto-grants-2011_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07897607B2

Reaction notes

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