A reaction mixture of β,γ-unsaturatedketone and BF 3 .OEt 2 in CH 3 OH was stirred at room temperature and β-methoxy ketone was produced in high yield. The β-amino ketone was obtained as the major product from a reaction mixture of β,γ-unsaturatedketone, AlCl 3 and Ts-NH 2 in CH 2 Cl 2 at room temperature. This Lewis acid promoted β-substitution reaction mechanism was proposed as that the process
Mixed anhydride steroid intermediate and process for preparing steroid intermediates
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0006355A1
公开(公告)日:1980-01-09
(A process for preparing steroid intermediates of the formula
in which pivaloyl chloride is added to a compound of the formula
the resulting compound of the formula
is reacted with a Grignard reagent of the formula
and the resulting compound of the formula
is cyclized in the presence of a base.
Compound I in turn may be readily converted by known methods to valuable steroids.
Disclosed as a mixed anhydride steroid intermediate of formula III is 7aβ-methyl-2,3,3aα, 4, 5, 6, 7; 7a-octahydro-1H-inden-1,5-dione-4a-(3-propionic acid) pivalic acid mixed anhydride.)
(一种制备式类固醇中间体的工艺
其中将特戊酰氯加入式化合物中
生成的式化合物
与式中的格氏试剂反应
生成的式化合物
在碱存在下环化。
化合物 I 又可以通过已知的方法很容易地转化为有价值的类固醇。
作为式 III 混合酸酐类固醇中间体公开的是 7aβ-甲基-2,3,3aα, 4, 5, 6, 7; 7a-八氢-1H-茚-1,5-二酮-4a-(3-丙酸)新戊酸混合酸酐)。
4,5-Unsaturated prostanoic acid derivatives
申请人:G.D. Searle & Co.
公开号:EP0050849A1
公开(公告)日:1982-05-05
4,5-Unsaturated 16-hydroxy prostanoic acid derivatives displaying valuable pharmacological properties, e.g. gastric antisecretory, are described herein.
A process for making certain 6-aryl-2-methyl-pyridines, which are useful intermediates in the preparation of biologically active compounds, comprises
(a) subjecting a ketal of 1-hydroxy-1-aryl-5-hexanone to a Jones oxidation to yield a 1-aryl-1,5-hexanedione; or treating the 1-aryl-1-hydroxy-5-ketal-hexane with manganese dioxide in solvent to yield a ketone; and
(b) reacting the 1-aryl-1,5-hexanedione or the ketone from (a) with excess hydroxylamine hydrochloride in polar solvent at a temperature of from 50°C to 100°C.