Investigations on Steroids. IV. Syntheses of Androstano[2, 3-c]-furazans and Related Compounds
作者:Genkichi Ohta、Toshio Takegoshi、Katsujiro Ueno、Masao Shimizu
DOI:10.1248/cpb.13.1445
日期:——
Steroids with a furazan ring fused to the 2, 3-positions were synthesized. 2, 3-Dihydroxyiminoandrostanes (III) prepared from androstan-3-ones (I), via 2-hydroxyimino-3-ketones (IV), or 2, 3-diketones (II), were cyclized directly to androstano[2, 3-c]furazans (XVII) by means of alkali, succinic anhydride or thionyl chloride. Alternatively, 2, 3-dihydroxyimino compounds (III) were treated with sodium hypochlorite or lead tetraacetate to afford the corresponding furazan N-oxides (furoxans)(XXI), which were deoxygenated to the furazans (XVII) by heating with triethyl phosphite. Similarly, androst-4-eno and androsta-4, 6-dieno[2, 3-c]furazans (XVII, XIX) were prepared. Syntheses of their derivatives were also described.
合成了与2, 3-位融合的呋噁环类固醇。通过2-羟基亚氨基-3-酮(IV)或2, 3-二酮(II)从雄甾-3-酮(I)制备的2, 3-二羟基亚氨基雄甾烷(III),在碱、琥珀酸酸酐或氯化亚硫酰的作用下,直接环化生成雄甾烷[2, 3-c]呋噁烷(XVII)。或者,将2, 3-二羟基亚氨基化合物(III)用次氯酸钠或四乙酸铅处理,得到相应的呋噁烷N-氧化物(呋氧烷)(XXI),再通过与三乙基磷酸酯加热处理去氧化为呋噁烷(XVII)。同样,合成了雄甾-4-烯和雄甾-4, 6-二烯[2, 3-c]呋噁烷(XVII, XIX)。还描述了其衍生物的合成。