Asymmetric Synthesis of the Cyclohexyl Fragment in RORγt Inhibitor (BMS-986251) Enabled by a Dynamic Kinetic Resolution of Hageman’s Ester
作者:William P. Gallagher、John R. Coombs、Carlos A. Guerrero、Boguslaw M. Mudryk、Kishta Katipally、Candice L. Joe、Sanjeewa Rupasinghe、Jason Zhu、Francisco González-Bobes
DOI:10.1021/acs.oprd.1c00339
日期:2022.3.18
fragment 1 in BMS-986251 was synthesized starting from Hagemann’s ester 2 in 7 steps and 5 isolations. The route is highlighted by a dynamic kinetic resolution (DKR), a telescoped enol nonaflation followed by a palladium-catalyzed carbonylation, and a rhodium-catalyzed directed diastereoselective olefin hydrogenation. The optimized process was demonstrated on 1 kg scale, with an overall 51% yield and >99%