Figure 1
The synthesis of the title compounds. Reagents and conditions. (i) trifluoromethanesulfonyl anhydride, DCM, pyridine, 243 K (to 2); methanesulfonyl chloride, DMAP, DCM, Et3N (67%) (to 3); (ii) NaN3, DMF, r.t. (88% over two steps from 1 via 2). The numbering system used is highlighted in red. |