Abstract
Abstract3‐Thioxoandrosta‐1,4‐dien‐17‐one (4) reacts with acetylene dicarboxylic acid esters to form novel spiro compounds of the thiine type (6a, 6b), whereas with free acids, such as acetylene dicarboxylic acid and propiolic acid, the spirocyclic O,S‐acetals 7a and 7b are obtained. This study demonstrates that the cycloaddition reaction is promoted by photochemical and also thermal activation.
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