Piperidine derivatives and compositions for the inhibition of nicotinamide phosphoribosyltransferase (NAMPT)

1. A process for preparing a compound of Formula II:

or a pharmaceutically acceptable salt thereof,

wherein:

W is —C(O)—;

R is aryl or bicyclic heteroaryl;

wherein said heteroaryl contains 1, 2, or 3 heteroatoms independently selected from N, S, and O, with the proviso that no two adjacent ring heteroatoms are both S or both O; and

each of said aryl or heteroaryl is optionally substituted with one or more substituents which can be the same or different and are independently selected from the group consisting of deuterium, halo, cyano, amino, aminoalkyl, (amino)alkoxy, —CONH 2 , —C(O)NH(alkyl), —C(O)N(alkyl) 2 , —C(O)NH(aryl), —C(O)N(aryl) 2 , —CF 3 , —CHF 2 , —CH 2 F, -alkyl, alkoxy, hydroxyl, hydroxyalkyl, (alkoxyalkyl) amino, —N(R 3 )—C(O)-alkyl, —N(R 3 )—C(O)-aryl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl, with the proviso that no two adjacent ring heteroatoms are both S or both O;

G is aryl, heteroaryl, cycloalkyl, heterocycloalkyl, or —NR 1 R 2 ;

wherein each of said aryl, heteroaryl, heterocycloalkyl and cycloalkyl is either unsubstituted or substituted with 1, 2, 3, or 4 substituents which can be the same or different and are independently selected from the group consisting of deuterium, halo, cyano, amino, aminoalkyl, (amino)alkoxy, —CONH 2 , —C(O)NH(alkyl), —C(O)N(alkyl) 2 , —C(O)NH(aryl), —C(O)N(aryl) 2 , —CF 3 , —CHF 2 , —CH 2 F, alkyl, alkenyl, alkynyl, alkoxy, hydroxyl, hydroxyalkyl, aryloxy, (alkoxyalkyl)amino, —N(R 3 )—C(O)-alkyl, —N(R 3 )—C(O)-aryl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl;

R 1 and R 2 are the same or they are different, and are independently selected from H, C 1 to C 7 alkyl, C 1 to C 7 alkoxy, C 1 to C 4 hydroxyalkyl, aryl, heteroaryl, heterocycloalkyl and cycloalkyl, and

wherein heteroatoms of said heteroaryl and heterocycloalkyl are independently selected from one or more of N, O and S, with the proviso that no two adjacent ring heteroatoms are both S or both O; and

wherein R 1 and R 2 are each unsubstituted or substituted with one or more substituents which can be the same or different and are independently selected from the group consisting of deuterium, halo, cyano, amino, aminoalkyl, (amino)alkoxy, —CONH 2 , —C(O)NH(alkyl), —C(O)N(alkyl) 2 , —C(O)NH(aryl), —C(O)N(aryl) 2 , —CF 3 , —CHF 2 , —CH 2 F, alkyl, hydroxyalkyl, alkoxy, hydroxyl, hydroxyalkyl, carboxy, (alkoxyalkyl)amino, alkylamine, aminocarbonyl, —CHO, —N(R 3 )—C(O)-alkyl, —N(R 3 )—C(O)-aryl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl;

R 3 is H; and

n is 4, 5, or 6;

wherein the process comprises a step of treating an acid:

with an amine:

in the presence of a base.

2. The process of claim 1 , wherein the acid is:

3. The process of claim 2 , wherein the process of obtaining the compound of Formula II further comprises addition of a coupling agent.

4. The process of claim 3 , wherein the coupling agent is EDCI, HATU, or HOBt.

5. The process of claim 3 , wherein the base is K 2 CO 3 , Cs 2 CO 3 , DIEA, NaOH, or KOH.

6. The process of claim 1 , wherein the acid is:

7. The process of claim 6 , wherein the base is TEA.