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. ... Diastereoselective routes to and ethyl 1-azabicyclo[2.2.1]hept-3-yl carboxylates (1) and (2) based on the hydrogen bromide cleavage of the isomeric [4.3.0] bicyclic fused lactones (3) and (4) are described. ... The and azabicyclic esters (1) and (2) are obtained by rearrangement of the ...