42221-72-7

Upstream product

• 1083309-00-5 C₁₀H₁₉BrO₂ 
• 702-50-1 2,2,5,5-tetramethylcyclohexa-1,3-dione 

Downstream Products

• 2935-23-1 cis-Chrysanthemic acid 

Relevant academic research and scientific papers

SUBSTITUTED BICYCLIC HETEROARYL COMPOUNDS AS RXR AGONISTS

The present invention relates to certain substituted bicyclic compounds that are agonists of RXR and which are therefore useful in the treatment of certain disorders that can be prevented or treated by activation of this receptor. In addition the invention relates to the compounds, methods for their preparation, pharmaceutical compositions containing the compounds and the uses of these compounds in the treatment of certain disorders.

Syntheses of racemic and scalemic cis-chrysanthemic acid from β,γ-unsaturated cyclohexanol

2,2,5,5-Tetramethylcyclohexane-1,3-dione is a valuable starting-material precursor of cis-chrysanthemic acid. The (1S)-stereoisomer is a precursor of pyrethrin I, the most active natural insecticide from Chrysanthemum cinerariifolium, whereas the (1R)-stereoisomer is efficiently transformed to deltamethrin, the most active commercially available pyrethroid insecticide. Several intermediates have been identified and used with variable success for that purpose.

Novel synthesis of (d,l)-cis-chrysanthemic acid involving α,α′-dibromination of 2,2,5,5-tetramethylcyclohexane-1,3-dione: application to the enantioselective synthesis of (1R)-cis-chrysanthemic acid

cis-Chrysanthemic acid has been prepared in a few steps from dimethyldimedone via dibromination at alpha positions of each carbonyl carbons. The trans-dibromide which is almost exclusively formed has been isomerized to its cis-stereoisomer by highly chemoselective tandem H/K-K/H exchanges involving potassium bases at low temperature (-40 °C). Carbocyclization of the potassium enolate intermediate takes place at around -30 °C and provide the bicyclo[3.1.0]-hexane skeleton. Lithiated bases behave differently and mainly lead to Br/M rather than to H/M exchange. We have been unsuccessful in using state of the art enantioselective metallation reactions to achieve the enantioselective synthesis of (1R)-cis-chrysanthemic acid using the disclosed strategy. This therefore still remains challenge.

Selected regiocontrolled transformations applied to the synthesis of (1S)-cis-chrysanthemic acid from (1S)-3,4-epoxy-2,2,5,5-tetramethylcyclohexanol

(1S)-cis-Chrysanthemic acid has been prepared in a few steps with complete control of the relative and absolute stereochemistry using regiocontrolled epoxide ring opening, diol mono-oxidation and cyclopropanation. The Royal Society of Chemistry.