Abstract: Certain aspects of the present invention are directed to improved processes for preparing enantiomerically enriched intermediates for the synthesis of ruxolitinib and deuterated forms of ruxolitinib. Certain aspects are also directed to deuterated intermediates useful in the synthesis of deuterated forms of ruxolitinib. Certain aspects are also directed to reaction mixtures for preparing enantiomerically enriched intermediates useful in the synthesis of ruxolitinib and deuterated forms of ruxolitinib.

Abstract: Improved processes and intermediates for preparing ruxolitinib, deuterated analogs of ruxolitinib, and other JAK inhibitors are disclosed.