Kazutada Ikeuchi

Divergent Synthesis of Four Monomeric Ellagitannins toward the Total Synthesis of an Oligomeric Ellagitannin, Nobotanin K

Hajime Hashimoto, Shinnosuke Wakamori, Kazutada Ikeuchi & Hidetoshi Yamada · Organics · 2022

Oligomeric ellagitannins are challenging synthetic targets due to the need for an abundant supply of their composed monomeric ellagitannins and a synthetic methodology to connect them. This work focused on the divergent synthesis of the four monomeric ellagitannins from a common...

Open access Research Article 10.3390/org3030022

Synthesis of Illisimonin a Skeleton by Intramolecular Diels–Alder Reaction of Ortho-Benzoquinones and Biomimetic Skeletal Rearrangement of Allo-Cedranes

Takahiro Suzuki, Riko Nagahama, Muhammad Aiman Fariz, Yuki Yukutake, Kazutada Ikeuchi & Keiji Tanino · Organics · 2021

Illisimonin A is a new sesquiterpene isolated from Illicium simonsii, and it possesses a novel 5/5/5/5/5 pentacyclic skeleton. The tricyclic skeleton of illisimonin A, tricyclo[5.2.1.01,5]decane, is presumed to be biosynthesized from allo-cedranes via a skeletal rearrangement. He...

Open access Research Article 10.3390/org2030016