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Published in last 50 years
Optically active pentacycles ( 13–18 ) were synthesized from L- and D-tryptophans, two of which ( 13 and 15 ) were alkylated and dehydrogenated to 21 and 22, respectively.
11α-Formyl-methyl derivative 5 of prednisolone has been reductively cyclized to give the versatile pentacyclic intermediates 7 and 9 of novel 1,11α-ethano-bridged corticosteroid analogues.
Synthesis in the series of diterpene alkaloids VIII. A stereospecific synthesis of pentacyclic intermediates with a bridge in ring B