Enantioselective Bromocyclization of Allylic Amides Catalyzed by BINAP Derivatives
摘要:
A highly enantioselective bromocyclization of allylic amides with N-bromosuccinimide (NBS) was developed with DTBM-BINAP as a catalyst, affording chiral oxazolines with a tetrasubstituted carbon center in high yield with up to 99% ee. By utilizing the bromo substituent as a handle, the obtained compounds were converted to synthetically useful chiral building blocks.
Visible-light-driven switchable divergent di- or tricarboxylation of allylic alcohols with CO is realized to selectively upgrade multiple CO units to polycarboxylic acids. The derivatization of corresponding polycarboxylic acids could deliver the potential functional materials in luminescence and biomaterials.