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200517.fm Page 81 Friday, March 18, 2005 2:52 PM
2005
Rings with 7 or more members
Q 0050
Microwave Enhanced Tandem 5-exo Cyclization/Claisen Rearrangement ReacA Convenient Route to Cycloheptanoid Ring Systems. — Appropriately
17- 078 tions:
substituted 4-alkyn-1-ols are converted by the title reaction sequence to bi-, tri-, and
tetracyclic cycloheptane derivatives. Catalytic amounts of MeLi and microwave irradiation are used to significantly enhance the reaction rates. The present method can also
be performed in the absence of solvents. — (MCINTOSH, C. E.; MARTINEZ, I.;
OVASKA*, T. V.; Synlett 2004, 14, 2579-2581; Dep. Chem., Conn. Coll., New
London, CT 06320, USA; Eng.) — Klein
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