Steroids and Walden inversion. Part LXI. Chlorination of 5α-cholestan-2-one
作者:C. W. Shoppee、S. C. Sharma
DOI:10.1039/j39670002385
日期:——
Monochlorination of 5α-cholestan-2-one yields 78% of the axial 3α-chloro-ketone, 19% of the equatorial 3β-chloro-ketone, and a little of the 3,3-dichloro-ketone under conditions in which the 3α-chloro-ketone is stable. Chlorination of the enol acetate of 5α-cholestan-2-one affords 3α-chlorocholestan-2-one, with traces of the 3β-chloro-ketone. 1α-Chloro-, 1α,3α-dichloro-, 1α,3β-dichloro-, 3,3-dichloro-
在3α的条件下,对5α-胆甾烷-2-酮进行单氯化可得到78%的轴向3α-氯代酮,19%的赤道3β-氯代酮和少量的3,3-二氯代酮。 -氯酮是稳定的。将5α-胆甾烷-2-酮的烯醇乙酸酯氯化,得到3α-氯胆甾烷-2-酮和痕量的3β-氯酮。制备了1α-氯-,1α,3α-二氯-,1α,3β-二氯-,3,3-二氯-和1α,3,3-三氯-5α-胆甾烷-2-一记录了紫外线,红外线,旋光色散和核磁共振特征。