Add time:07/14/2019         Source:sciencedirect.com

An enantioselective total synthesis of (+)-picrasin B (1) from the R-(-)-enantiomer of the Wieland-Miescher ketone (4) employed an A-AB-ABC-ABCD sequence to assemble the tetracyclic skeleton and relied upon a free radical cyclization of an α-bromoacetal to an enone in order to introduce the D ring and a manganese(III) acetate oxidation of a tricyclic enone intermediate in order to introduce the C-11 oxygen substituent.

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