232ChemInform Abstract Cyclization of the Si-substituted α-diazoketone (I) gives the electron-rich heptafulvene (II) which is extremely sensitive to oxidation by air and to moisture. (8 + 2)Cycloaddition of (II) with the N-methyltriazoledione (III) produces the 1:1 adduct (IV). (Mechanism, 1H-NMR-data).
Whereas 2‐lithiothiophene reacts with N‐pivaloylaziridine (II) exclusively at the carbon atom to give the product (I), reaction with the aziridines (IV) leads to the desired ring opening to yield the sulfonamides (V).
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