Af. Barrero et al., SYNTHESIS OF (+ -)-KARAHANA ETHER AND KARAHANAENONE BY SELECTIVE CYCLIZATION OF 6,7-EPOXYGERANYL ACETATE/, Tetrahedron, 50(46), 1994, pp. 13239-13250
Efficient methods for preparing (+/-)-karahana ether (1b) and karahana
enone (2) from 6,7-epoxygeranyl acetate(3), by Lewis-acid-catalyzed el
ectrophilic cyclization, are described.