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2005
Pyran derivatives
R 0340
The Furan Approach to Oxacycles. Part 3. Stereoselective Synthesis of
Tetrahydropyrans. — Commercially available furan (I) is convert26- 079 2,3-Disubstituted
ed to trans and cis tetrahydropyrans (VI) and (VII) using a highly efficient route to
oxacycles. The latter is based on the oxidation of furan (II) with singlet oxygen. The
final opening of lactone (V) performed under optimized conditions gives the easily separable target pyrans as structural units in natural polyethers. — (ALONSO, D.;
PEREZ, M.; GOMEZ, G.; COVELO, B.; FALL*, Y.; Tetrahedron 61 (2005) 8,
2021-2026; Dep. Quim. Org., Univ. Vigo, E-36200 Vigo, Spain; Eng.) — Klein
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