PROCESS FOR PREPARATION OF 13,14-DIHYDRO-PGF2 ALPHA DERIVATIVES
申请人:MARTYNOW Jacek
公开号:US20080207926A1
公开(公告)日:2008-08-28
The invention relates to a process for the preparation of 13,14-dihydro-PGF
2α
derivatives of R or S configuration at carbon 15, represented by the general formula (I), wherein the identity of the substituents is defined in the description. Compounds of the formula (I) are valuable biologically-active substances or intermediates in the preparation thereof. The invention especially relates to the process for preparation of 13,14-dihydro-15(R)-17-substituted-18,19,20-trinor-PGF
2α
, i.e., latanoprost.
Iodohydrins and corresponding ethers were synthesized by an electrochemical process using inexpensive and non-toxic ammonium iodide. This transformation was applied to a panel of alkenes, giving products without the need of external hazardous oxidants, reductants or metal catalyst. This protocol showed a general efficiency to synthesize valuable iodinated molecules with yields from 19% to 90%.
2-Iodoethanols from aldehydes, diiodomethane and isopropylmagnesium chloride
作者:Hannes A. Braun、Reinhard Meusinger、Boris Schmidt
DOI:10.1016/j.tetlet.2005.02.093
日期:2005.4
Diiodomethane and iodoform react with i-PrMgCl by halogen-metal exchange. The resulting magnesium reagents tolerate several functional groups, but aldehydes are converted selectively into iodoethanols in good to high yields. These mild reagents preserve racemization prone centres. The substrate controlled diastereoselectivity provides straightforward access to important intermediates of peptidomimetics. (c) 2005 Elsevier Ltd. All rights reserved.