“…In our search for new functionalized and heterocyclic systems from naturally occurring terpenes (Ziyat et al, 2002(Ziyat et al, , 2004Fdil et al, 2002;Feddouli, El Kadib et al, 2004;Dakir et al, 2004), we recently reported that (1R)-thiocamphor, (1), and Cethoxycarbonylnitrilimines (2a)-(2c) react efficiently to give, diastereoselectively, the novel spiranic 1,3,4-thiadiazolines (3a)-(3c), whose structures and absolute configurations were proved beyond doubt using X-ray diffraction ) (see first scheme below). We have also commented that some of the diazolo rings reported in the literature are unstable (Huisgen et al, 2001).…”