R e a r r a n g e m e n t R e a c t i o n s ; 1 2 : 1 S y n t h e s i s a n d R e a c t i o n s o f I s o t h i o c y a n a t e S u b s t i t u t e d Abstract: The first method for the preparation of isothiocyanate substituted allenes by [3,3] sigmatropic rearrangement of propargyl thiocyanates is described. These allenes undergo a variety of successive reactions such as ionic or sigmatropic isomerization, electrocyclic ring closure, cycloaddition, and electrophilic addition. Furthermore, intramolecular nucleophilic attack as well as treatment with external nucleophiles lead to heterocyclic products.
Ungewöhnlich reaktiv gegenüber Nucleophilen sind die Allenylisothiocyanate 1 (R1,R2 = H oder Me), die über [3,3]‐sigmatrope Umlagerungen aus leicht zugänglichen Propargylthiocyanaten hergestellt werden können. Über ähnliche Isomerisierungsreaktionen gelingt auch die Herstellung von 2 und 3 (R = H, Me), Diese Verbindungen eignen sich für die Synthese von Heterocyclen und für Cycloadditionsreaktionen.
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