申请人:Schering Aktiengesellschaft
公开号:US04404141A1
公开(公告)日:1983-09-13
.DELTA..sup.16 - and .DELTA..sup.17 -21-chloro-20-keto steroids of the formula ##STR1## wherein n is 1 or 2, C.sub.1 C.sub.2 and C.sub.9 C.sub.11 represent a CC-single or CC-double bond, R.sub.1 is H or OH, R.sub.2 is H or CH.sub.3, R.sub.3 is H or F wherein, when R.sub.3 =F, C.sub.9 C.sub.11 is a CC-single bond, and R.sub.4 is H, CH.sub.3, or F, are valuable intermediates for preparation of highly effective, known steroids. A process for preparing these compounds involves heating the corresponding 11.beta.- and/or 17.alpha.- or 17a.alpha.-nitrooxy-21-mesyloxy-20-keto steroids with lithium chloride in a dipolar aprotic solvent at temperatures above room temperature.
.DELTA..sup.16-和.DELTA..sup.17-21-氯-20-酮类固醇的公式为##STR1##其中n为1或2,C.sub.1 C.sub.2和C.sub.9 C.sub.11代表CC单键或CC双键,R.sub.1为H或OH,R.sub.2为H或CH.sub.3,R.sub.3为H或F,当R.sub.3=F时,C.sub.9 C.sub.11为CC单键,R.sub.4为H,CH.sub.3或F,是制备高效已知类固醇的有价值中间体。制备这些化合物的方法包括将相应的11.beta.-和/或17.alpha.-或17a.alpha.-硝酰氧-21-甲磺氧-20-酮类固醇与氯化锂在非极性溶剂中加热至室温以上。