K. Kawai et al., ESTABLISHMENT OF EFFICIENT HYDROXYLATION AT ANGULAR POSITION OF 4A-ARYL-TRANS-DECAHYDROISOQUINOLINES, Heterocycles, 48(5), 1998, pp. 949-959
Efficient hydroxylation method at angular 8a position of 4a-aryl-trans
-decahydroisoquinolines was described. By utilizing the transformation
process, syntheses of 2-methyl- and -methoxyphenyl)-6-oxo-trans-decah
ydroisoquinolines (13 and 17), the useful molecules as an opioid messa
ge substructure, were attained. The key step in this transformation wa
s N-protection of enamine intermediate by 2, 2,2-trichloroethoxycarbon
yl chloride and subsequent epoxidation and hydride reduction.