Lewis Acid-Catalyzed Intramolecular [2 + 2] Cycloaddition of α-Ester-Substituted Conjugated Dienyl- and Trienylphosphonates. New Synthesis of Functionalized Cyclic Terpenoids
- 1 November 1997
- journal article
- Published by American Chemical Society (ACS) in The Journal of Organic Chemistry
- Vol. 62 (24) , 8419-8424
- https://doi.org/10.1021/jo971153g
Abstract
α-Ester-substituted 1,3-dienylphosphonates 7 and 8, prepared by the Knoevenagel condensation, underwent intramolecular [2 + 2] cycloaddition in the presence of Lewis acid to form bicyclo[4.2.0] (26−57% yield) and bicyclo[3.2.0]skeleton (14−38% yield), respectively. Similar treatment of homologous 1,3-dienylphosphonate 11 and 1,3,5-trienylphosphonate 12 resulted in the formation of ionone derivatives (30−94% yield). The intramolecular cycloaddition reaction was applicable to several conjugated dienes bearing an ester group.Keywords
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