Ka. Parker et D. Fokas, THE RADICAL CYCLIZATION APPROACH TO MORPHINE - MODELS FOR HIGHLY OXYGENATED RING-III SYNTHONS, Journal of organic chemistry, 59(14), 1994, pp. 3933-3938
4-Iodo-3-methyl-2-cyclohexenone (9) and 3-alkyl 3-cyclohexene-1,2-diol
derivatives 16 were examined as ring-III equivalents for the tandem r
adical cyclization approach to the synthesis of morphine (1a).