90428-68-5

Upstream product

• 98736-18-6 4-bromo-3-methyl-2-pentyl-cyclopent-2-enone 
• 563-63-3 silver(I) acetate 
• 108-24-7 acetic anhydride 
• 98736-16-4 3-methoxy-2,5-undecanedione 
• 58237-58-4 1-Diazooctan-2-one 
• 98736-17-5 tetrahydropyrethrolone methyl ether 
• 98736-12-0 1-((1R,2S,3R)-2,3-Dimethoxy-2-methyl-cyclopropyl)-heptan-1-one 

Downstream Products

• 13074-63-0 2-pentyl-3-methyl-cyclopentan-1-one 

Relevant academic research and scientific papers

Oxocyclopentenol Syntheses

Metal-assisted decomposition of α-diazo carbonyl compounds in 1,2-dialkoxy-1-alkenes are shown to yield β,β'-dialkoxycyclopropyl carbonyl systems, whose acid hydrolysis produces α-alkoxy-γ-dicarbonyl substances.Intramolecular condensations of the latter lead to oxocyclopentenols.Application of this reaction scheme to the syntheses of a prostaglandin intermediate and of tetrahydropyrethrolone is described.

Process for preparing 2-cyclopentenone esters

2-Cyclopentenone esters of the formula: STR1 wherein R1 is hydrogen, lower alkyl or lower alkenyl, R2 is lower alkyl, lower alkenyl, lower alkynyl, or cycloalkyl, cycloalkenyl or substituted or unsubstituted aryl and R3 is hydrogen or lower alkyl are prepared in high yields by reacting the corresponding racemic or optically active 4-cyclopentenone of the formula: STR2 wherein R1 and R2 are each as defined above and R3 is hydrogen or acyl with at least one lower aliphatic carboxylic acid and/or metal or amine salts thereof.