89498-93-1Relevant articles and documents
Total Synthesis of (+)-Quassin
Shing, Tony K. M.,Jiang, Qin
, p. 7059 - 7069 (2007/10/03)
A total synthesis of (+)-quassin from naturally occurring (S)-(+)-carvone is described. The total number of steps was 28, and the overall yield was about 2.6%. The synthetic strategy for the construction of the tetracyclic carbon framework was based on a C→ABC→ABCD ring annulation sequence, involving an aldol reaction, an intramolecular Diels - Alder reaction, and an intramolecular acylation as the key steps. Subsequent functionalization of ring A and ring C then afforded the target (+)-quassin.
NEW QUASSINOID GLYCOSIDES AND HEMIACETALS FROM PICRASMA AILANTHOIDES PLANCHON. PICRASINOIDE-B,-C,-D,-E,-F, AND -G, AND PICRASINOL-A AND -B
Okano, Masayoshi,Fujita, Tomoyuki,Fukamiya, Narihiko,Aratani, Takaaki
, p. 221 - 224 (2007/10/02)
New quassinoid glucosides, picrasinoside-B,-C,-D,-E,-F, and -G, and quassinoid hemiacetals, picrasinol-A and -B, were isolated from the bark of Picrasma ailanthoides PLANCHON, and their structures are established by spectral analysis and chemical transformations.
