AbstractAn efficient base catalyzed oxacyclization of Z‐enynols has been developed under transition metal‐free reaction conditions, thus resulting in a variety of new di‐, tri‐, and tetra‐substituted furans. This approach allowed us to obtain 32 new compounds. Furthermore, DFT calculations were realized to depict a relationship between the natural population analysis and experimental results with alkyl or aryl groups for the synthesis of 2‐benzylfuran. A one‐pot Sonogashira/oxacyclization approach offers a flexible, robust and efficient alternative to base catalyzed cyclization is also carried out.
The total syntheses of (+)-inthomycin A, (+)-inthomycin B and (−)-inthomycin C, the oxazole-triene antibiotics isolated from Streptomyces sp., have been accomplished via the highly enantio- and stereoselective construction of the C1–C7 (iododienyl)aldol units by taking advantage of a Cinchona alkaloid-catalyzed asymmetric β-lactone synthesis and their isomerisation-free Stille coupling with (E)-5-