Substituted alkyl 1, 3-butadiene-2-carboxylates have been thoroughly studied in recent years as potential starting materials for organic synthesis, in particular for various [4 t 2] cycloadditions. A number of these compounds have proven to be valuable precursors for functionalized alkyl 1-cyclohcxene-I-carboxylates,“5 naturally occurring cyclopentanoid terpenic acids,“and biologically important litsenolides. 7 Numerous ap-proaches to ...
