Abstract
Use of sulphur-stabilized cyclopropyl anions has led to novel ways of forming carbon-carbon bonds, including spiroannelation, cyclopentane annelation, geminal alkylation and secoalkylation. Direct sulphenylations alpha to a carbonyl group have also led to useful structural modifications, including introduction of a double bond in conjugation with a carbonyl group, carbonyl transposition and alkylative elimination. A new method to introduce carbon-carbon bonds specifically alpha to a double bond under mild conditions based on organopalladium chemistry is developed and holds special promise in chiral syntheses.
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