Prenylquinolinones and Hemiterpenoid Tricyclic Alkaloids

3 Prenylquinolinones and Hemiterpenoid Tricyclic Alkaloids.-3-Prenylquinolinones are well-known constituents of rutaceous plants and are biosynthetic and synthetic precursors of hemiter-penoid quinoline alkaloids all aspects of their chemistry feature 

A new approach to the synthesis of 3-prenyl-2-quinolinones begins with a 3-carboxymethyl-2-quinolinone and gives a mixture of 

New alkaloids obtained from the stem bark of Vepris louisii 

Reagents i, Me2C=CHCH2Br, Bu N Cl, PhMe, NaOH ii, HCl, EtOH iii, CH2N2, MeOH  

Myrtopsine (34), first obtained from Myrtopsis sellingii (cf. 

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