Process for preparing beta 3 agonists and intermediates
The application is directed to efficient and economical processes as described in more detail below for the preparation of the beta 3 agonists of the formula of I-7 and intermediate compounds that can be used for making these agonists. The present disclosure relates to a process for making beta-3 agonists and intermediates using ketoreductase (KRED) biocatalyst enzymes and methods of using the biocatalysts.
1. A process of making compound I-7:
comprising:
(a) coupling compound I-4:
with compound A-1:
in the presence of Catalyst D to produce compound I-5(a), followed by deprotecting in situ with an acid to produce compound I-5(b) as a salt:
(b) cyclizing the salt of compound I-5(b) to produce compound I-6-1:
(c) reducing compound I-6-1 in the presence of Catalyst E to produce compound I-6:
and
(d) coupling compound I-6 with compound A-2:
in the presence of a coupling agent and optionally including a base to produce compound I-7:
wherein P 1 is selected from the group consisting of Ac, Bn, Boc, Bz, Cbz, DMPM, FMOC, Ns, Moz, and Ts;
Y is selected from the group consisting of Cl, I, Br, and OTf; and
R is selected from the group consisting of H, TMS, TES, TBDMS, TIPS and TBDPS;
wherein Catalyst D is selected from the group consisting of Pd(PPh 3 ) 4 , PdCl 2 , (PPh 3 ) 2 PdCl 2 , Pd(dppe)Cl, Pd(dppp)Cl, Pd(dppf)Cl, and Pd(OAc) 2 /Ph 3 P, wherein each catalyst can optionally be accompanied by a catalytic amount of material selected from the group consisting of Cut CuBr, and CuCl; and
wherein Catalyst E is selected from the group consisting of Pt/Al 2 O 3 , Pd/Al 2 O 3 , Rh/Al 2 O 3 , Pd/C, Pd(OH) 2 —C, Pt on alumina-V on carbon or vanadate, Raney Ni, Rh/C, Rh/Al, Pt/C, Ru/C, and PtO 2 .
2. The process of claim 1 , wherein the reaction in step (a) is carried out in the presence of a solvent selected from the group consisting of THF, IPA, MeOH, EtOH, n-PrOH, NMP, DMF, DMAc, MTBE, CH 2 Cl 2 , MeCN, Me-THF, methyl cyclopentyl ether, toluene, and combinations thereof.
3. The process of claim 1 , wherein the reaction product in step (a) is isolated as an HCl salt.
4. The process of claim 1 , wherein step (b) is conducted in the presence of a base selected from the group consisting of Et 3 N, i-Pr 2 NEt, i-Pr 2 NH, pyridine, lutidine, N-methyl morpholine, t-BuOK, t-BuONa, t-BuOLi, NaH, NaHMDS, LiHMDS, and KHMDS.
5. The process of claim 1 , wherein compound I-6-1 is not isolated.
6. The process of claim 1 , wherein step (c) is conducted in the presence of hydrogen gas.
7. The process of claim 1 , wherein the coupling agent in step (d) is selected from the group consisting of CDI, DCC, EDC, EDC methiodide, T3P, HATU, HBTU, and mix-anhydrides.
8. The process of claim 1 , wherein compound I-6 is coupled with compound A-2 in the presence of a coupling agent and a base.
9. The process of claim 8 , wherein the base is pyridine or a pyridine salt.