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2005
Multi-membered O,N,S-heterocycles
R 0692
Samarium Diiodide in the Synthesis of Medium-Sized Rings — Carbocycles and
by Intramolecular Addition of Samarium Ketyls to Alkynes. — The
20- 169 Heterocycles
title study shows that electronic, steric and conformational effects have a significant
influence on the efficacy of the cyclizations. The presence of an aryl spacer between
the carbonyl group and the alkyne moiety and/or of heteroatoms in β-position to the
alkyne is very beneficial. The carbocycles are prepared in low to moderate yields; formation of N- and O-heterocycles is smoothly achieved in most cases (to be continued).
— (HOELEMANN, A.; REISSIG*, H.-U.; Synlett 2004, 15, 2732-pp; Inst. Chem.,
FU Berlin, D-14195 Berlin, Germany; Eng.) — Steudel
2005
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