Development of a Practical Synthesis of the Fragment of OPC-167832.

A concise and practical synthesis has been developed to provide the 8-fluoro-5-hydroxy-3,4-diydrocarbostyril () fragment of OPC-167832 in 41% yield and in >99% purity over four steps from 3-amino-4-fluorophenol. The key feature of this process is the development of a telescoped one-pot synthesis of the quinolone via a chemoselective amidation/acid-induced cyclization that allows for simple product isolation without the need for column chromatography.

Development of a Modified System to Provide Improved Diastereocontrol in the Linear-Selective Cu-Catalyzed Reductive Coupling of Ketones and Allenamides.

Chiral γ-lactones are prevalent organic architectures found in a large array of natural products. In this work, we disclose the development of a modified catalytic system utilizing a commercially available Cu-phosphite catalyst for the diastereoselective reductive coupling of chiral allenamides and ketones to afford chiral γ-lactone precursors in 80:20 to 99:1 dr.