Griseofulvin derivatives, dl-6'-demethyl-6'-ethylgriseofulvin (dl-5) and dl-6'-demethyl-6'-phenylgriseofulvin (dl-6) were prepared by application of a synthetic method developed by us. Antifungal activity of these derivatives decreased in the order of dl-griseofulvin (dl-1)>dl-5»dl-6 (inactive). The reaction of these derivatives with ethanethiol gave two types of compounds, 2'-(ethylthio)griseofulvin (15) and 4'-(ethylthio)isogriseofulvin (16). The relationship between the ratios of isolated yield of 15 and 16 and antifungal the activity of griseofulvin derivatives is discussed.
MASSON S.; THUILLIER A., TETRAHEDRON LETT. 1980, 21, NO 42, 4085-4086
作者:MASSON S.、 THUILLIER A.
DOI:——
日期:——
Preparation of α-ethylenic ketene dithioacetals from α-oxoketene dithioacetals.
作者:Serge Masson、André Thuillier
DOI:10.1016/0040-4039(80)88072-5
日期:1980.1
1,1-bis (methylthio)-1,3-dienes and 1,1-bis (methylthio)-3-trimethylsilyloxy-1,3-dienes were respectively prepared by Wittig olefination and by enol-silylation of α-oxoketene dithioacetals.
An Improved Synthetic Method for<i>dl</i>-Griseofulvin and Its 2′-<i>S</i>-Analogue
作者:Masatoshi Yamato、Yasuo Takeuchi、Hideo Tomozane
DOI:10.1055/s-1990-26942
日期:——
An improved synthetic method for dl-giseofulvin (4) and its 2′-S-analogue 8 has been developed. 7-Chloro-4,6-dimethoxy-2-[5-methoxy-1-methylthio-3-oxohexylidene]-3 (2H)-benzofuranone (7), prepared by reaction of the corresponding 3 (2H) -benzofuranone with 1,1-bis(methylthio)-5-methoxy-1-hexen-3-one (6), undergoes stereoselective intramolecular cyclization when treated with activated alumina in refluxing diethyl ether. The product, the 2′-S-analogue of dl-griseofulvin 8, is converted to dl-griseofulvin (4) in good yield.