Compounds useful as Raf kinase inhibitors

A compound of formula I:

• or a pharmaceutically acceptable salt thereof, wherein:
• Cy1 is an optionally substituted 5-6 membered partially unsaturated or aromatic ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, and sulfur;
• Cy2 is an optionally substituted 5-14 membered saturated, partially unsaturated, or aromatic monocyclic, bicyclic, or tricyclic ring having 0-4 heteroatoms, independently selected from nitrogen, oxygen, and sulfur;
• L1 is a direct bond or an optionally substituted, straight or branched C1-6 alkylene chain;
• L2 is a direct bond, or is an optionally substituted, straight or branched C1-6 alkylene chain wherein 1 or 2 methylene units of L2 are optionally and independently replaced by —O—, —S—, —N(R)—, —C(O)—, —C(O)N(R)—, —N(R)C(O)N(R)—, —N(R)C(O)—, —N(R)C(O)O—, —OC(O)N(R)—, —SO2—, —SO2N(R)—, —N(R)SO2—, —OC(O)—, —C(O)O—, or a 3-6 membered cycloalkylene;
• each R is independently hydrogen or an optionally substituted C1-6 aliphatic group;
• R1 is hydrogen or an optionally substituted C1-6 aliphatic group;
• each of Rx and Ry is independently selected from —R2, -halo, —NO2, —CN, —OR2, —SR2, —N(R2)2, —C(O)R2, —CO2R2, —C(O)C(O)R2, —C(O)CH2C(O)R2, —S(O)R2, —S(O)2R2, —SO2N(R2)2, —OC(O)R2, —N(R2)C(O)R2, —N(R2)N(R2)2, —N(R2)—C(═NR2)N(R2)2, —C(═NR2)N(R2)2, —C═NOR2, —N(R2)C(O)N(R2)2, —N(R2)SO2N(R2)2, —N(R2)SO2R2, and —OC(O)N(R2)2;
• and
• each R2 is independently hydrogen or an optionally substituted group selected from C1-6 aliphatic, a C6-10 monocyclic or bicyclic aryl ring, and a 5-10 membered saturated, partially unsaturated, or aromatic monocyclic or bicyclic ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur, or
• two R2 on the same nitrogen are taken together with the nitrogen to form an optionally substituted 5-8 membered saturated, partially unsaturated, or aromatic ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur.