the dual electrophilic properties of (2-chloro-2-nitroethenyl)benzenes in a one-pot, formal [3+2] cycloaddition. Using a base (DBU), the desired trisubstituted heterocycles were formed rapidly (10–30 min) in good to excellent yields (51–92 %), and this versatile, metal-free methodology was applied to the synthesis of 2-acyl- and 2-carboalkoxyfurans and furan-2-carboxamides. Additionally, by using 2-ketophosphonate
When activated with Takemoto’scatalyst, 1,2‐keto esters constitute versatile nucleophiles in the Michaeladdition reaction with nitroalkenes affording synthetically valuable, optically active anti‐adducts in very good yields and high enantiomeric excesses.
[EN] PROCESS FOR PRODUCING CARBOXYLIC ACID ESTER<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN ESTER D'ACIDE CARBOXYLIQUE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2012176930A1
公开(公告)日:2012-12-27
An object of the present invention is to provide a new process which can produce a carboxylic acid ester from an aldehyde. The object is achieved by a process for producing a carboxylic acid ester, including the step of mixing a compound represented by the formula (2-1): (wherein R2 represents an alkyl group optionally having a substituent, or the like; R3 and R4 each represent independently an alkyl group optionally having a substituent, or the like, or R3 and R4 are taken together to form a divalent hydrocarbon group optionally having a substituent, or the like; Y represents a group represented by -S- or a group represented by -N(R5)-; R5 represents an alkyl group optionally having a substituent, or the like, or R5 is taken together with R4 to form a divalent hydrocarbon group optionally having a substituent; and X- represents an anion), a base, an alcohol, oxygen and an aldehyde to oxidize the aldehyde.
[EN] PROCESS FOR PRODUCING CARBOXYLIC ACID ESTER<br/>[FR] PROCÉDÉ DE PRODUCTION D'ESTER D'ACIDE CARBOXYLIQUE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2012026617A1
公开(公告)日:2012-03-01
The present invention relates to a process for producing a carboxylic acid ester, comprising a step of oxidizing an aldehyde by mixing an alcohol, carbon dioxide, the aldehyde and at least one compound selected from the group consisting of compounds represented by the formulae (2-1) and (2-2): wherein R2 represents an alkyl group optionally having a substituent or the like; R3 and R4 each independently represents an alkyl group optionally having a substituent or the like or R3 and R4 are linked together to form a divalent hydrocarbon group optionally having a substituent or the like; Y represents a group of -S- or a group of -N(R5)-, wherein R5 represents an alkyl group optionally having a substituent or the like, or R5 is linked to R4 to form a divalent hydrocarbon group optionally having a substituent; and R8 represents an alkyl group.
This invention relates to new substituted semicarbazides having angiotension converting enzyme inhibitory activity, pharmaceutical compositions thereof and processes for the production thereof.