The first asymmetric total synthesis of a structurally unique alkaloid, chamobtusin A (1), is described. The route features a novel aziridine formation from the 1,2-oxazine derivative and a palladium-mediated annulation of the vinylaziridine intermediate.
Synthesis of (−)-Chamobtusin A from (+)-Dehydroabietylamine
作者:Naoki Mori、Kazuma Kuzuya、Hidenori Watanabe
DOI:10.1021/acs.joc.6b02328
日期:2016.12.2
Chamobtusin A, a unique diterpene alkaloid isolated from Chamaecyparis obtusa cv. tetragon, is considered to be biosynthesized from an abietane diterpenoid. On the basis of this biosynthetic hypothesis, ferruginol (15) was synthesized from (+)-dehydroabietylamine and then biomimetically transformed into (−)-chamobtusin A in 6 steps (12 steps from (+)-dehydroabietylamine).