Flexible two-step synthesis of the bicyclo[3.3.1]nona-2,6-diene skeleton and its 9-hetera-analogues from (Z,Z)-cyclo-octa-1,5-diene
Abstract
A new method for the preparation of the 9-heterabicyclo[3.3.1]nona-2,6-dienes (Ia and d–f), and of 9,9-dicyanobicyclo[3.3.1]nona-2,6-diene (Ig) from (Z,Z)-cis-3,7-dibromocyclo-octa-1,5-diene (II) is described.