Inhibitors of microsomal triglyceride transfer protein and method
申请人:Bristol-Myers Squibb Company
公开号:US05739135A1
公开(公告)日:1998-04-14
Compounds are provided which inhibit microsomal triglyceride transfer protein and thus are useful for lowering serum lipids and treating atherosclerosis and related diseases. The compounds have the structure ##STR1## wherein R.sup.1 to R.sup.7, Q, X and Y are as defined herein.
Iron-copper cooperative catalysis is shown to be effective for an alkene-Grignard exchange reaction and alkylmagnesiation of alkynes. The Grignard exchange between terminal alkenes (RCH═CH(2)) and cyclopentylmagnesium bromide was catalyzed by FeCl(3) (2.5 mol %) and CuBr (5 mol %) in combination with PBu(3) (10 mol %) to give RCH(2)CH(2)MgBr in high yields. 1-Alkyl Grignardreagents add to alkynes in the
Lithium acetylides with functional groups such as orthoester or acetal group in the molecule react with trialkylboranes with the migration of alkyl groups. The oxidation of the intermediates obtained from triethyl orthopropiolate gives a mixture of β-hydroxy-and α,β,-unsaturated esters, and the oxidation of those from propiolaldehyde diethylacetal gives (E)-1-ethoxy-1-alken-3-ones respectively.
A new and single-step method for the synthesis of trisubstituted α,β-unsaturated esters using the lithium enolates of S-1-ethoxycarbonylethyl diethyl phosphorothioate (Ib) and S-1-ethoxycarbonylbutyl diethyl phosphorothioate (Ic) has been developed.