- Synthesis of 3-Aminoimidazo[1,2-a]pyridines from α-Aminopyridinyl Amides
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3-Aminoimidazo[1,2-a]pyridines are rapidly synthesized via a facile and mild cyclodehydration-aromatization reaction starting from readily available amides. The cyclodehydration step is mediated by the activation of N-Boc-protected 2-aminopyridine-containing amides by triflic anhydride (Tf2O) in the presence of 2-methoxypyridine (2-MeO-Py). Subsequently, the addition of K2CO3 in THF ensured a clean deprotection-aromatization sequence to afford the desired heterocycle. A wide variety of functional groups and substitution patterns were tolerated under the optimized procedure, and good to excellent yields were obtained for the fused bicyclic 3-aza-heterocycles. In addition, the reaction was found to be scalable to gram-scale and could be performed with unprotected acyclic amide precursors. We also found that the resulting products were valuable intermediates for both Pd- and Ru-catalyzed C-H arylation reactions, allowing for the elaboration to diversely functionalized building blocks.
- Régnier, Sophie,Bechara, William S.,Charette, André B.
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- OXADIAZOLYLTHIOPHENE DERIVATIVES USEFUL AS HISTONE DEACETYLASE INHIBITORS
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A compound of Formula I : (I) or a pharmaceutically acceptable salt thereof, wherein: each R' is QR1; each Q is independently selected from a bond, -C1-C10 alkylene, -C2-C10 alkenylene, -C(O)-, -C(O)O-, -C(O)N(R1)-, -C(O)N(R1)SO2- -N(R1)C(O)-, - N(R1)-, -N(SO2(R1)), -N(R1)SO2- -C(O)NR4R5-, -N(R4R5)C(O)-, -N(R4R5)- - S-, -SO-, -SO2-, -S(O)O-, -SO2N(R1)- and -O-; each R1 is independently selected from H, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 haloalkyl, C1-C10 heteroalkyl, aryl, heteroaryl, C3-C10 cycloalkyl, -(C1-C10 alkylene)-C3-C10 cycloalkyl, halogen, cyano, C1-C10 alkylene- aryl, C1-C10 alkylene heteroaryl, C1-C10 heterocycloalkyl and -(C1-C10 alkylene)- C1-C10 heterocycloalkyl. The compounds are inhibitors of HDAC and therefore have potential utility in the therapy of a number of conditions including cancer and inflammation.
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Page/Page column 191; 192
(2019/09/18)
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