
TY  - JOUR
A1  - Cambie, RC 
A1  - Franich, RA 
T1  - Chemistry of the Podocarpaceae. XXIV. Ring-A modifications of Abieta- 8,11,13-trien-18-oic acid
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1970
VL  - 23
IS  - 1
SP  - 93
EP  - 105
KW  - 
UR  - https://doi.org/10.1071/CH9700093 
N2  - A convenient route from abieta-8,11,13-trien-18-oic acid (10) to abieta5,8,11,13-tetraen-3-one (27) has been developed involving selective epoxidation of the alkene mixture (2) obtained by oxidative decarboxylation of the acid with lead tetraacetate. Treatment of the 3a,4a-epoxide (9) with lithium diethylamide gives a quantitative yield of the allylic alcohol (19). Brief treatment of this allylic alcohol with N-lithioethylenediamine gives the &#945;, &#946;-unsaturated alcohol (25), which on oxidation affords the enone (24). Methylation of the latter compound with methyl iodide and potassium t-butoxide in t-butanol yields abieta-5,8,11,13-tetraen-3-one (27) in 43% overall yield from the alkene mixture (2). Other reactions of the 3&#945;, 4&#945;-epoxide (9) are reported and discussed. 
ER  -

