A quadruple cascade protocol for the one-pot synthesis of fully-substituted hexahydroisoindolinones from simple substrates

A new and efficient synthetic method to obtain fully-substituted hexahydroisoindolinones was developed by using bifunctional tertiary amine-thioureas as powerful catalysts. As far as we know, there is no efficient synthetic method developed toward fully-substituted hexahydroisoindolinones. The products were obtained in good yield and diastereoselectivity. The one-pot cascade quadruple protocol features readily available starting materials, simple manipulation, mild conditions and good atom economy.

Synthesis of hexahydro-1H-isoindole derivatives from arylacyl bromides via homoallenic bromohydrins

A procedure has been developed for the concise synthesis of hexahydro-1H-isoindole derivatives starting from phenacyl bromides. The approach employs a sequence involving an initial indium-mediated allenylation reaction of an arylacyl bromide with propargyl bromide. This process is followed by FeBr3-mediated SN2'-type substitution reaction of the formed homoallenic bromohydrin to produce a 2,5-dibromo-4-aryl-1,3-pentadiene, which then is subjected to a sequential, one-pot N-alkylation reaction with N-allyl-N-(p-tosyl)amine and a highly diastereoselective intramolecular Diels-Alder reaction of the formed ene-diene to generate the target hexahydro-1H-isoindole.

Efficient Synthesis of Pyrazole Fused [6-7-5] Tricyclic Frameworks via Intramolecular Friedel–Crafts Reaction of Morita–Baylis–Hillman Adducts

A novel and efficient synthesis of pyrazole fused[6-7-5]tricyclic derivatives via AlCl3-catalysed intramolecular Friedel–Crafts reaction of the Morita–Baylis–Hillman adducts was described and a plausible mechanism was given.