Total synthesis of silychristin, an antihepatotoxic flavonolignan.
作者:Hitoshi TANAKA、Masaru HIROO、Kazuhiko ICHINO、Kazuo ITO
DOI:10.1248/cpb.37.1441
日期:——
The total synthesis of silychristin, an antihepatotoxic flavonolignan, is described. The key intermediate, the transdihydrobenzofuran (15) was synthesized as follows. Treatment of the chalcone epoxide (9) with boron trifluoride etherate and subsequent reduction with sodium borohydride gave exclusively the erythro-1, 2-diaryl-1, 3-propanediol (10). Hydrogenolysis of 10 with hydrogen over a palladium catalyst followed by cyclization of the debenzylation product (13) with boron trifluoride etherate in acetic acid afforded 15 as a single product.