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2004
Pyran derivatives
R 0340
New Annulations via Platinum Catalyzed Enyne Cyclization and Cyclopropane
— The cyclopropane ring of (II) and (VII), obtained by PtCl2-catalyzed
52- 114 Cleavage.
cyclization of (I) and (III), resp., undergoes a novel benzannulation to give ring systems
which are difficult to obtain by other methods. The oxidative transformation proceeds
readily to form oxygen-containing heterocyclic skeletons. The attempts to carry out
similar transformations with (XVII) result in a complicated mixture of products. —
(NEVADO, C.; FERRER, C.; ECHAVARREN*, A. M.; Org. Lett. 6 (2004) 18,
3191-3194; Inst. Chem. Res. Catalonia, E-43007 Tarragona, Spain; Eng.) — Steudel
2004
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