Benzene → HCID 12390441, compound

HRID 1607421Notes

Reaction equation

HRID 1607421 reaction equation
[C:1]1(C)[CH:6]=[CH:5][C:4]([S:7](O)(=O)=O)=CC=1.[CH:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>C1(C)C=CC=CC=1>[CH:12]1([C:4]2[S:7][CH:1]=[CH:6][CH:5]=2)[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]1

Participants

4

Reactant 2

HCID 241BenzeneHCID 6101p-Toluenesulfonic acid

Product 1

HCID 12390441HCID 12390441, compound

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

Synthesis substrates 4H-indeno[1,2-c]thiophen-4-one and 4H-indeno[1,2-c]thiophene and their derivatives are prepared in accordance with MacDowell and Jefferies, J. Org. Chem., 35, 871 (1970). Wherein treatment of 4-bromo-3-thienyllithium with a commonly available lower alkyl substituted cyclohexanone or cyclohexanone, such as 4-methylcyclohexanone, at -65° to -75° C. yields the corresponding cyclobenxanol derivative which is dehydrated with para-toluenesulfonic acid in refluxing benzene or toluene to yield a cyclohexylthiophene product such as 3-bromo-4-(4-methyl-1'-cyclohexenyl)thiophene. Dehydrogenation with tetrachlorobenzoquinone in refluxing xylene for 8-24 hours yields the corresponding 3-bromo-4-phenylthiophene, e.g., 3-bromo-4-(4'-methylphenyl)thiophene. After purification by sublimation and/or chromatography over alumina, the bromide is subjected to halogen-metal exchange at -65° to -75° C. with n-butylithium in ether, followed by carbonation with carbon dioxide. The isolated 3-phenyl-thiophene-4-carboxylic acid derivative, e.g., 3-(4'-methylphenyl)thiophene-4-carboxylic acid, is converted with thionyl chloride to the acid halide. Ring closure to the ketone via heating the aroyl chloride and aluminum cloride in carbon disulfide for 18-36 hours yields the corresponding ketone, such as 6-methyl-8H-indeno[ 1,2-c]thiophen-8-one. This 8-one derivative, which may be further derivatized according to Method V, is converted (in accordance with Method I) into a hydantoin derivative. Wolff-Kishner reduction (Method VIII) of the 8-one derivative (and optional derivatization according to Method V) and spiro-derivatization in accordance with Methods II, III and IV yields the corresponding spiro-thiazolidinedione, spiro-oxazolidine-dione and spiro-succinimide derivatives respectively. These spiro-derivatives may be further derivatized according to Method VI.

Sources & evidence

ORD record
ord-816d9dcc938345da896d0b41d6df35c3
Source dataset
uspto-grants-1989_09
Patent number
US04864028

Reaction notes

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