STEREOSELECTIVE METHOD OF PRODUCING 6ALPHA-FLUOROPREGNANES AND INTERMEDIARIES
申请人:Ragactives, S.L.
公开号:EP1422235B1
公开(公告)日:2006-10-04
Stereoselective process for the production of 6alpha-fluorpregnanes and intermediates
申请人:Ragactives, S.L.
公开号:US20040181055A1
公开(公告)日:2004-09-16
6&agr;-fluorpregnanes (I), where the dotted line between positions 1 and 2 represents a single or double bond; R1 is OH, OCOR
2
, X, SO
3
R
3
, or an (R
7
)(R
8
)(R
9
)SiO— group, where X is halogen, R
2
and R
3
are C
1-6
alkyl or phenyl optionally substituted by C
1-4
alkyl, and R
7
, R
8
and R
9
, equal or different, are C
1-6
alkyl or phenyl optionally substituted by C
1-4
alkyl, can be obtained by means of a high stereoselectivity process comprising reacting a 3-(trisubstituted)silyloxy-pregna-3,5-diene (IV) with a fluorinating agent selected among N-fluorosulfonimides and N-fluorosulfonamides. The 6&agr;-fluorpregnanes (I) are intermediates for the synthesis of steroids useful as anti-inflammatory and anti-asthmatic agents.