| 摘要 |
<p>Title cpds. having a cis bond at 4a, 10b posns, are of formula (I) (where R1 is H, lower alkyl, lower alkoxy, F, Cl, Br, CF3 or NO2, R2 is H, Cl, lower alkyl or lower alkoxy, R3 is methoxy or the two R3 together form methylenedioxy) are prepd. by oxidising cpds. (II) of formula: Oxidation is conducted by adding an aqs. soln of KMnO4 into a soln. of cpd. II in inert solvent.</p> |
