HuagongsheHuagongshe Chemistry Print Report · For research reference only
Diethyl Malonate → Ethyl 4-(3,5-di-tert-butyl-4-hydroxyphenyl)-2-oxo-2,6,7,8-tetrahydrocyclopenta[g][1]benzopyran-3-carboxylate
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Diethyl Malonate | HCID 7761 | — |
| Reactant | 1,8-Diazabicyclo(5.4.0)undec-7-ene | HCID 81184 | — |
| Reactant | HCID 19936580 | HCID 19936580 | — |
| Product | Ethyl 4-(3,5-di-tert-butyl-4-hydroxyphenyl)-2-oxo-2,6,7,8-tetrahydrocyclopenta[g][1]benzopyran-3-carboxylate | HCID 19782167 | 87.8% |
Reaction Steps
A mixture of 5- (3,5-di-tert-butyl-4-hydroxybenzoyl)-6-hydroxyindan (2.8 g), diethyl malonate (3.6 g) and DBU (0.12 ml) was heated at 160°-170° C. for 2 hours. After cooling, the resulting crystals were collected by filtration and washed with ethanol to give ethyl 4-(3,5-di-tert-butyl-4-hydroxyphenyl)-2-oxo-2,6,7,8-tetrahydrocyclopenta [g] [1]benzopyran-3-carboxylate (3.1 g, 87.8%). Recrystallization from ethanol gave colorless prisms, m.p. 208°-209° C.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US05418239 |
| Source dataset | uspto-grants-1995_05 |
| ORD ID | ord-39327534f9f6407da25e5ec506d843ce |
| Source note | uspto-grants-1995_05 |