Abstract
A formal synthesis of the top half fragment of bryostatin 11 has been developed. Stereoselective construction of the B ring was achieved by using a ring-closing metathesis reaction in conjunction with asymmetric glycolate alkylation. Furthermore, the C1-C9 fragment was synthesized by Brown allylation, chelation-controlled aldol condensation, and Saksena-Evans reduction to construct all stereogenic centers.
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