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2004
Multi-membered N-heterocycles
R 0690
Diversity-Oriented Synthesis of Azaspirocycles. — C-[1-(2-arylallyl)cyclopropyl](I), (XIII) and (XVIII) provide valuable starting points for the diversity50- 136 -alkylamines
-oriented synthesis of heterocycles. Functionalized pyrrolidines, piperidines, and
azepines are easily accessible by means of selective ring-closing metathesis, epoxide
opening, or reductive amination in 2-3 steps in good overall yields. Ring-closing metathesis of bisallylated product (XXII) provides the 11-membered (XXIII) rather than
the azepine product. — (WIPF*, P.; STEPHENSON, C. R. J.; WALCZAK, M. A. A.;
Org. Lett. 6 (2004) 17, 3009-3012; Dep. Chem., Univ. Pittsburgh, Pittsburgh,
PA 15260, USA; Eng.) — Steudel
2004
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