Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The use of radical cyclisations allows direct access to a family of azaspirocyclic ketones, including compounds having the azaspiro[4.4]nonane, and azaspiro[5.5]undecane structures which are found in the alkaloids cephalotaxine and histrionicotoxin.
