Synthesis of Nitrogen‐Containing Spiro Compounds from Lactams by Allylboration and Subsequent Ring‐Closing Metathesis

Abstract

Abstract A series of nitrogen‐containing spiro[4. n ]alkenes was prepared with excellent yields starting from lactams in two steps: allylboration on the carbonyl carbon and subsequent ring‐closing metathesis of the 2,2‐diallyl N‐heterocycles. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)