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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.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
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