A new application of aryl participated cyclisation involving diazomethyl ketone: Stereocontrolled synthesis of angularly ester substituted trans-octahydrophenanthrene ring system related to diterpenes
A highly stereocontrolled synthesis of the angularly ester substituted trans-octahydrophenanthrene derivative 14 has been accomplished using acid-induced intramolecular cyclisation of the diazoketone 12 as the key step.