2,2-Dimethyl-1,3-dioxane-4,6-dione → 5-(4-(1H-1,2,4-triazol-1-yl)benzyl)-2,2-dimethyl-1,3-dioxane-4,6-dione

HRID 928791Notes

Reaction equation

N1CCC[C@H]1C(O)=O.[N:9]1([C:14]2[CH:21]=[CH:20][C:17]([CH:18]=O)=[CH:16][CH:15]=2)[CH:13]=[N:12][CH:11]=[N:10]1.[CH3:22][C:23]1([CH3:31])[O:28][C:27](=[O:29])[CH2:26][C:25](=[O:30])[O:24]1.CC1NC(C)=C(C(OCC)=O)CC=1C(OCC)=O>C(O)C.C(O)(C)C>[N:9]1([C:14]2[CH:21]=[CH:20][C:17]([CH2:18][CH:26]3[C:27](=[O:29])[O:28][C:23]([CH3:31])([CH3:22])[O:24][C:25]3=[O:30])=[CH:16][CH:15]=2)[CH:13]=[N:12][CH:11]=[N:10]1

Participants

Conditions

Temperature: 23 °C

Procedure

L-Proline (1.81 g, 15.6 mmol) was added to a stirring, heterogeneous mixture of 4-(1H-1,2,4-triazol-1-yl)benzaldehyde (13.5 g, 78.0 mmol, Intermediate 45, step a) and 2,2-dimethyl-1,3-dioxane-4,6-dione (11.2 g, 78.0 mmol) in ethanol (520 mL) at 23° C. After 1.5 hours, diethyl 1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylate (19.7 g, 78.0 mmol) was added in one portion. After 16 hours, the ethanol was removed by rotary evaporation at 35° C. to afford a yellow solid. Isopropanol (300 mL) was added and the heterogeneous mixture was stirred for 10 minutes at 23° C. The mixture was filtered and the filter cake was washed with isopropanol (150 mL). The solids were collected and dried under vacuum to provide the titled compound as a white solid.

Workup

waitAfter 16 hours
customthe ethanol was removed by rotary evaporation at 35° C.
customto afford a yellow solid
filtrationThe mixture was filtered
washthe filter cake was washed with isopropanol (150 mL)
customThe solids were collected
customdried under vacuum

Sources & evidence

ORD record: ord-3286efe9a0f847df95b6f42f55b4b2d2
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09290476B2

Reaction notes

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