申请人:CHINOIN PHARMACEUTICAL AND CHEMICAL WORKS PRIVATE CO. LTD.
公开号:US20200165186A1
公开(公告)日:2020-05-28
Preparation of the compounds of general formula I, among them misoprostol where R represents a straight- or branched-chain C
1-4
alkyl group by cuprate coupling of the vinyl cuprate of general formula II prepared by reacting the vinyl stannane of general formula III with copper halide CuX and alkyllithium R
1
Li wherein: R
2
stands for H or an alcohol-protecting group which may contain silicium atom, as for instance trimethylsilyl-, triethylsilyl-, tert.-butyldimethylsilyl- group, or a cyclic or open-chain alkyl group containing oxygen atom, as for instance tetrahydropyranyl-, methoxymethyl- or ethoxymethyl- group; X means I, Br, CN, SCN, OSO
2
CF
3
group, R
1
represents C
1-6
alkyl group, n>2, if R
2
is not hydrogen atom, n>3, if R
2
is hydrogen atom, and the protected enone of the general formula IV 30 22 IV where R
3
represents THP- or trialkylsilyl-group and the meaning of R is as defined above takes part in the cuprate reaction 5 in a manner that a.) the excess of the alkyllithium, which is applied as compared to the Cu(I) iodide in the case of R
2
≠H in 2-2.4 molar ratio, in the case of R
2
=H in 3-3.4 molar ratio, is decomposed before the coupling reaction of II and IV, b.) the protecting groups of the resulting compound of the general formula V 15 V where the meanings of R, R
2
and R
3
are as defined above are removed, the obtained compound of the general formula I is purified by chromatography.