Synthesis of pyranicin and its deoxygenated analogues and their inhibitory action with bovine heart mitochondrial complex I

Synthesis of (+)-Muconin via Diastereoselective Oxypalladation

Synthesis of (+)-muconin isolated from Rollinia mucosa (Annonaceae) was achieved. Stereoselective construction of a tetrahydrofuran-terahydropyran (THF-THP) ring moiety was performed using diastereoselective oxypalladation in the presence of CuCl₂. The cross-coupling reaction of the THF-THP moiety with the γ-lactone portion followed by reduction of the enyne and removal of the protecting groups afforded (+)-muconin.

Stereoselective Aminopalladation and Oxypalladation and Their Application to the Synthesis of Natural Products

Stereoselective aminopalladation and oxypalladation are very important approaches for the synthesis of various natural products which contain N- and O-hetero-alicycles. The author has reviewed recent progress of synthesis of natural products using Pd(II)-catalyzed aminopalladation and oxypalladation including our work within this decade.

Synthesis of annonacin isolated from Annona densicoma

A total synthesis of annonacin (1) was accomplished by using versatile chiral building block 2 for synthesizing the mono-tetrahydrofuran (THF) annonaceous acetogenins.

Asymmetric total synthesis of pyranicin

The asymmetric total synthesis of pyranicin (1) is reported. The butenolide ring was constructed via an asymmetric alkylation/ring-closing metathesis strategy. The three stereocenters in the left-hand tetrahydropyran ring were installed by sequential chiral auxiliary-mediated aldol reactions. Closure of the tetrahydropyran and fusion of the alkyl backbone were affected via a sequential ring-closing metathesis-cross-metathesis strategy.

A concise and modular synthesis of pyranicin

A modular, 13-step synthesis of the tetrahydropyran-containing annonaceous acetogenin pyranicin is reported. Key features are the use of an Achmatowicz oxidation-Kishi reduction sequence for the assembly of a pyranone from a furan and the application of Fu's alkyl-alkyl Suzuki coupling for subunit union.