Diversity by divergence: Solution-phase parallel synthesis of a library of N-diversified 1-oxa-7-azaspiro[4.5]decan-2-yl-propanes and -butanes

Brønsted Acid-Mediated Domino One-Pot Dual C-C Bond Formation: Chemoselective Synthesis of Fused Tricyclic Ketones

A chemoselective synthesis of fused novel tricyclic motifs via a facile domino intramolecular cyclization is presented. The strategy enables the formation of dual C-C bond via intramolecular Friedel-Crafts alkylation followed by acylation to accomplish fused tricyclic ketones. Significantly, these fused tricyclic compounds are ubiquitous and constitute major structural cores of natural products.

Synthesis of Spirocyclic Pyrrolidines: Advanced Building Blocks for Drug Discovery

In the context of drug discovery, novel spirocyclic pyrrolidines have been synthesized in two steps from common three- to seven-membered-ring (hetero)alicyclic ketones. The key transformation is a reaction between an electron-deficient exocyclic alkene and an in situ generated N-benzyl azomethine ylide. The developed method has been used to synthesize the central diamine core of the known antibacterial agents Sitafloxacin and Olamufloxacin.

Synthesis of cyclic 1,3-diols as scaffolds for spatially directed libraries

A useful design element in small molecule libraries is spatial diversity, in which binding moieties are systematically directed toward different regions of three-dimensional space. One way of achieving this is through the use of conformationally diverse scaffolds onto which various binding moieties can be placed. Such scaffolds can represent synthetic challenges of their own. In this paper, we describe a new route to chiral, cyclic 1,3-diol building blocks that features silylated dithianes as relay linchpins. These diols are subsequently used for the construction of a 24-compound pilot library bearing two amino acid residues.

One-pot C–C/C–O bond formation: synthesis of spirocyclic lactones

An efficient and practical method for the synthesis of novel spiro(tri or tetra)cyclic lactones via the formation of C–C and C–O bonds in one-pot is presented.