Synthesis of compounds related to gibberellic acid. Part IV. Construction of a tetracyclic system containing functional elements of rings A, C, and D

Abstract
The synthesis from suitable indane derivatives of methyl 16,16-ethylenedioxy-3-methoxy-9αH-gibba-1(10),2,4-triene-4-carboxylate (27b) and the corresponding 1(10),2,4,9(11)-tetraene (34b), possible intermediates for the total synthesis of gibberellin A4(1b), is described.

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