作者:Takumi Furuta、Miho Nakayama、Hirotaka Suzuki、Hiroko Tajimi、Makoto Inai、Haruo Nukaya、Toshiyuki Wakimoto、Toshiyuki Kan
DOI:10.1021/ol900689m
日期:2009.6.4
The regioselective synthesis of chafurosides A (1) and B (2) from the same methyl ketone 5 was accomplished using a novel protecting group strategy. Both flavone rings were constructed from beta-diketone intermediate 4, which was readily obtained by condensation of an acyl donor and ketone 5. Construction of the dihydrofuran ring was achieved via an intramolecular Mitsunobu reaction.
249. Usnic acid. Part VIII. C-diacetyl derivatives of phloroglucinol and C-methylphloroglucinol