Synthesis of (±)-8-Deisopropyladunctin B

Sayo Nomura, Kenji Arimitsu, Satoshi Yamaguchi, Yuya Kosuga, Yuko Kakimoto, Takanori Komai, Kazumasa Hasegawa, Akira Nakanishi, Tamami Miyoshi, Hiroki Iwasaki, Minoru Ozeki, Ikuo Kawasaki (+3 others)
2012 Chemical and pharmaceutical bulletin  
8-Deisopropyladunctin B, the deisopropyl form of adunctin B, which was isolated from the leaves of Piper aduncum (Piperaceae) collected in Papua New Guinea, was synthesized in 0.77% overall yield in 17 steps from 5,7-dimethoxycoumarin-3-carboxylate. The key step was our original stereoconvergent skeleton transformation from 1,2,2a,8b-tetrahydro-3H-benzo[b]cyclobuta[d]pyran-3-one to 1,2,4a,9b-tetrahydrodibenzofuran-4-ol with dimethylsulfoxonium methylide.
doi:10.1248/cpb.60.94 pmid:22223380 fatcat:ey3fcksyj5gchih4mju7xn6qc4