Formal [4 + 2] cycloaddition of imines with alkoxyisocoumarins

Intramolecular formal [4+2] cycloaddition of 3-ethoxycyclobutanones and alkenes.

Intramolecular formal [4+2] cycloaddition between 3-ethoxycyclobutanones and a carbon-carbon double bond to the corresponding bicyclo[4.n.0]alkan-2-one derivatives proceeded effectively by using ethylaluminium dichloride.

Osmapyridine and osmapyridinium from a formal [4+2] cycloaddition reaction.

Stereoselective Lewis base catalyzed formal 1,3-dipolar cycloaddition of azomethine imines with mixed anhydrides.

Stereoselective synthesis of pyrazolidinones via dipolar cycloaddition of azomethine imines with active esters under Lewis base catalysis is presented. The active esters are readily generated in situ from the corresponding acids. Products, which are obtained with excellent diastereocontrol and high enantioselectivity, contain along with the pyrazolidinone core also the tetrahydroisoquinoline st...

Intramolecular Cycloaddition of Imines of Cysteine Derivatives*

Azomethine ylides were generated from Schiffs bases of S-allylcysteine methyl ester and their intramolecular 1,3-dipolar cycloadditions were studied. These reactions led to the synthesis of thieno[3,4b]pyrrole derivatives in good yield.

1,3-Dipolar Cycloaddition Reaction of Nitrile Oxides to Isatin Imines

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