Abstract
The reactivity of donor–acceptor (D–A) cyclopropanes towards acceptor‐substituted ketenedithioacetals was investigated. In a Lewis‐acid‐catalyzed (3+2)‐cycloaddition, the corresponding dithiaspiro compounds were synthesized in good yields. The 1,3‐dithiane unit, a masked keto functionality, was cleaved by N‐iodosuccinimide. Thus, this two‐step process represents a formal insertion of an acceptor‐substituted ketene into a D–A cyclopropane.
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