Hydrochloric Acid → HCID 178458878, compound

HRID 1084666Notes

Reaction equation

[C:1]([C:5]1[C:6](=[O:31])[CH2:7][CH:8]([C:17]2[CH:22]=[CH:21][C:20]([O:23][CH2:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=3)=[CH:19][CH:18]=2)[CH:9](C(OCC)=O)[C:10]=1[OH:11])(=[O:4])[CH2:2][CH3:3].[OH-].[Na+].Cl>C(O)C.O>[C:1]([C:5]1[C:6](=[O:31])[CH2:7][CH:8]([C:17]2[CH:22]=[CH:21][C:20]([O:23][CH2:24][C:25]3[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=3)=[CH:19][CH:18]=2)[CH2:9][C:10]=1[OH:11])(=[O:4])[CH2:2][CH3:3]

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of 54 g (0.13 mol) of 2-propionyl-3-hydroxy-5-(4-benzyloxyphenyl)-4-(carboethoxy)cyclohex-2-en-1-one 30 g (0.37 mol)of 50 percent sodium hydroxide in 450 mL of 95 percent ethanol and 100 mL of water was stirred mechanically and heated at about 70° C. for 16 hours. The resulting clear yellow solution was cooled to about 60° C. and treated with 50 mL of concentrated HCl (some material was lost as the ensuing decarboxylation reaction erupted from the reaction vessel). The product precipitated from the solution and was isolated by filtration. Recrystallization from absolute ethanol gave the above named product as a beige crystalline solid in a yield of 24 g (54 percent of theoretical). The product melted at 114°-115° C.: 1H NMR (CDCl3) δ1.17 (t, 3H, --CH3), 2.60-3.48 (m, 7H, ring protons and --CH2CH3), 5.05 (s, 2H, ArCH2O--), 6.83-7.55 (m, 9H, ArH's), 18.1 (s, 1H, enol, H).

Workup

temperatureThe resulting clear yellow solution was cooled to about 60° C.
customwas lost as the ensuing decarboxylation reaction
customThe product precipitated from the solution
customwas isolated by filtration
customRecrystallization from absolute ethanol
customgave the

Sources & evidence

ORD record: ord-414671d6be0e4253980c0a9fcd8d3d53
Source dataset: uspto-grants-1991_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05006159

Reaction notes

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