Structural diversity through intramolecular cycloaddition and modulation of chemical reactivity in excited state. Synthesis and photoreactions of 3-oxa-tricyclo[5.2.2.01,5]undecenones: novel stereoselective route to oxa-triquinanes and oxa-sterpuranes
摘要:
Synthesis of 11-methyl-3-oxa-tricyclo[5.2.2.0(1,5)]undecenones by intramolecular Diels-Alder reaction of highly labile spiroepoxycyclohexa-2,4-dienones and its photochemical reactions upon tripler (T-3) and singlet (S-1) excitation leading to a stereoselective route to oxa-triquinane and oxa-sterpurane, respectively, is described. (C) 2000 Elsevier Science Ltd. All rights reserved.