Pd-Catalyzed Dynamic Kinetic Asymmetric Cross-Coupling of Heterobiaryl Bromides with N‑Tosylhydrazones
Organic Letters(2022)
摘要
A dynamic kinetic asymmetric Pd-catalyzed cross-coupling reaction of heterobiaryl bromides with ketone N-tosylhydrazones for the synthesis of heterobiaryl styrenes is described. The combination of Pd(dba)2 as a precatalyst with a TADDOL-derived phosphoramidite ligand provides the corresponding coupling products in good yields and high enantioselectivities under mild conditions. Racemization-free N-oxidation and N-alkylation of the products allowed us to obtain appealing functionalized axially chiral heterobiaryl derivatives.
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关键词
heterobiaryl bromides,pd-catalyzed,cross-coupling
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