An analog of 5α-hydroxyecdysteroids having an isoxazole ring in the side chain was synthesized starting from pregnenolone through intermediate 20-hydroxy-20-(3-isopropyl-4,5-dihydroisoxazol-5-yl) derivative. α-Bromination of 6-oxo steroids was accompanied by elimination of the hydroxy group from C20 and migration of the double bond thus formed to the heteroring to afford the corresponding 20-isoxazolyl steroid.
一种具有
异恶唑环的5α-羟基激素类类似物是从孕
甾醇出发,通过中间体20-羟基-20-(3-异丙基-4,5-二氢
异恶唑-5-基)衍
生物合成的。6-氧类甾体的α-
溴化伴随着C20羟基的消除,以及形成的双键迁移到杂环,从而得到相应的20-
异恶唑基甾体。