New Pathways in Transannular Cyclization of Germacrone [Germacra-1(10),4,7(11)-trien-8-one]: Evidence Regarding a Concerted Mechanism
作者:Alejandro F. Barrero、M. Mar Herrador、José-Luis López-Pérez、Jesús F. Arteaga、Julieta Catalán
DOI:10.1021/ol901066x
日期:2009.11.5
cyclization of germacrone with HSO3Cl at −78 °C by means of a concerted and regioselective mechanism gives rise to a bicyclo[6.2.0]decan-2-ylium intermediateion, which evolves to unusual skeletons through subsequent cyclization and Wagner−Meerweinrearrangements. This novel germacra-1(10),4-diene cyclization could suggest the existence of a new biosynthetic pathway to sesquiterpenes.
Structural Diversity from the Transannular Cyclizations of Natural Germacrone and Epoxy Derivatives: A Theoretical-Experimental Study
作者:M. Carmen Pérez Morales、Julieta V. Catalán、Victoriano Domingo、Martín Jaraíz、M. Mar Herrador、José F. Quílez del Moral、José-Luis López-Pérez、Alejandro F. Barrero
DOI:10.1002/chem.201300662
日期:2013.5.17
Treatment of germacrone (1) with different electrophiles, and of its epoxyderivativesgermacrone‐4,5‐epoxide (2), germacrone‐1,10‐epoxide (3) and isogermacrone‐4,5‐epoxide (4) with Brönsted/Lewis acids and TiIII, gives rise to a great structuraldiversity. Thus, by using a maximum of two steps, the production of more than 40 compounds corresponding to 14 skeletons is described. Computational calculations