A newringexpansion of 1-acyl-1-[p-tolyl(or methyl)thio]cyclobutanes to give 2-[p-tolyl(or methyl)thio]cyclopentanones and its application to the synthesis of 2-, 2,4-, or 2,5-substituted cyclopentanones were studied.
in the presence of a base (n-BuLi or KH) gave three-, four-, five-, and six-membered 1-methylsulfinyl-1-methylthiocycloalkanes. These cyclization products were easily converted to the corresponding ketones by acid hydrolysis except 1-methylsulfinyl-1-methylthiocyclopropane which afforded a complicated mixture. The combination of the cyclization with the acid hydrolysis thus provides a new method for
Novel cyclic ketone mercaptal S-oxides and a process for preparing these compounds which comprises reacting formaldehyde mercaptal S-oxides with specific difunctional compounds.
dialkylation of alkene is an efficient protocol for constructing useful chemicals, but challenges remain in the unrestricted application of alkylating reagents. Alkyl bromide belongs to the easy-to-access and operable alkyl electrophiles that can be used in reductivecoupling with alkenes. Here, we reported convenient strategies for dialkylcyclization and homodialkylation of unactivated β,γ- and γ,δ-unsaturated
2-Substituted-1,3-propylidenediphosphonate derivatives, the process for their preparation and pharmaceutical compositions containing them
申请人:SYMPHAR S.A.
公开号:EP0173041A1
公开(公告)日:1986-03-05
2-Substituted-1,3-propylidenediphosphonates of formula (I), where A, R' and R2 are defined in Claim 1, are therapeutically active compounds, namely for the treatment of cardiovascular diseases.
They can be prepared by reacting phosphonating agents with 1,3- dibromopropanes or ditosylates of 1,3-propanediols substituted in position 2.