Superacid mediated intramolecular condensation: facile synthesis of indenones and indanones
作者:Bokka Venkat Ramulu、Gedu Satyanarayana
DOI:10.1039/c5ra12234a
日期:——
sequential method for the synthesis of indanones is advantageous, as it limits even more electron rich external arenes only to the Friedel–Crafts alkylation. This is not possible in previous reports wherein both cinnamic acid ester and the external arenes are treated together in the presence of an acid, wherein the relatively more reactive arene is preferred to facilitate the acylationstep.
New Intramolecular Five-Endo-Mode Cyclization of Allenyl Aryl Ketones
作者:Yoshimitsu Nagao、Woo-Song Lee、Kweon Kim
DOI:10.1246/cl.1994.389
日期:1994.2
A convenient preparation of allenyl aryl ketones was achieved by the Weinreb-modified Grignard reaction of N-methoxy-N-methylamides with propargylmagnesium bromide. On treatment with BF3·OEt2, the allenyl aryl ketones were converted to methylenebenzocyclopetenones via a new 5-endo-mode cyclization.