Abstract:The process development toward synthesizing a diethanolamine (DEA) boronic ester and the subsequent Suzuki− Miyaura coupling (SMC) is disclosed herein. A one-pot lithiation−borylation−transesterification was successfully developed to isolate the DEA boronic ester as a stable crystalline solid and avoided the formation of boronic acid or pinacol boronic ester analogues, which have poor physical properties and purity profiles. The crystalline DEA boronic ester was also successfully employed in the SMC, and the i… Show more
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