Cyclisation of diethyl 3-allyloxy-1-propynylphosphonates with Mo(CO)(6) under PK conditions to give 3-substituted-5-oxo-3,5,6,6a-tetrahydro-1H-cyclopenta[c]furan-4-ylphosphonate, 2a-h, in 45-88% isolated yields was done. The R groups are always syn with H(b) (where applicable). The stereochemistry was determined via both NMR and crystal X-ray analysis.

Organo-phosphorus compounds S 0080Mo (CO)6-Mediated Intramolecular Pauson-Khand Reaction of Substituted Diethyl 3-Allyloxy-1-propynylphosphonates. -The method allows a facile access to novel bicyclic phosphonates like (III) and (V). -(MORADOV, D.; AL QUNTAR, A. A. A.; YOUSSEF, M.; SMOUM, R.; RUBINSTEIN, A.; SREBNIK*, M.; J. Org.

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