Contra-thermodynamic halolactonization of lactam-tethered 5-aryl-4(E)-pentenoic acids for the flexible and stereocontrolled synthesis of fused lactam-halolactones

Abstract

The contra-thermodynamic halolactonization of lactam-tethered 5-aryl-4(E)-pentenoic acids, under solvent- and catalyst-controlled conditions, has facilitated the efficient and stereocontrolled synthesis of halogenated fused γ-lactone-lactams.

Revisiting the 1,3-azadiene-succinic anhydride annulation reaction for the stereocontrolled synthesis of allylic 2-oxopyrrolidines bearing up to four contiguous stereocenters

“…, glutaric anhydride, 2,2-dimethylglutaric anhydride, 3-methylglutaric anhydride, diglycolic anhydride, thiodiglycolic anhydride, and MIDA anhydride) react competently with appropriately substituted 1,3-azadienes. 9 a – g Recently, we revealed that highly reactive phenylsuccinic anhydride is amenable to chemoselective and stereocontrolled pentannulation with 1,3-azadienes at room temperature. 9 h – j…”

Diastereospecific arylation and cascade deconstructive amidation/thioesterification of readily available lactam-fused bromolactones

“…Fragment libraries consisting of a variety of 3D scaffolds are expected to display a wider range of biological activities compared to single scaffold libraries. Within this context, and as part of a program aimed at leveraging the synthetic versatility of the 1,3-azadiene-anhydride reaction, 8 our group has identified the catalytic halolactonization 8 g , h of lactam-bearing alkenoic acids of type 1 (Fig. 2A/B) and subsequent interrogation of the lactam-halolactones (see 2/3 ) in fragment growth protocols as an important research objective (Fig.…”