Reactions of η2-tetracarbonylmanganese complexes derived from podocarpic acid with electrophiles; functionalization of ring C
作者:Richard C. Cambie、Michael R. Metzler、Clifton E.F. Rickard、Peter S. Rutledge、Paul D. Woodgate
DOI:10.1016/0022-328x(92)80117-g
日期:1992.6
se(I) complexes derived from podocarpic acid (1) with electrophilic bromine or iodine in CCl4 leads to 14-halogenated derivatives inaccessible by direct halogenation. Similar reactions in protic solvents lead to the formation of γ-lactones in high yield. The structure of one of these was established unequivocally by X-ray crystallography. Attempted oxidation of the CMn bond with a number of reagents
Cyclomanganation of diterpenoids; functionalization of C14
作者:Richard C. Cambie、Michael R. Metzler、Peter S. Rutledge、Paul D. Woodgate
DOI:10.1016/0022-328x(90)85462-8
日期:1990.1
Orthomanganated complexes have been made from carbonyl derivatives of the ring-C aromatic diterpenoids podocarpicacid and dehydroabietic acid. Activation of these complexes with Me3NO followed by coupling reactions with various substituted alkenes results in efficient substitution at C14. In some cases a tetracyclic indenol derivative is formed directly. Insertion of an alkyne also leads to cyclopentaannulation