Synthesis of functionalized imidazolidine-2-thiones via NHC/base-promoted aza-benzoin/aza-acetalization domino reactions
作者:Graziano Di Carmine、Daniele Ragno、Carmela De Risi、Olga Bortolini、Pier Paolo Giovannini、Giancarlo Fantin、Alessandro Massi
DOI:10.1039/c7ob02259j
日期:——
A strategy for the synthesis of biologically relevant 5-hydroxy-imidazolidine-2-thione derivatives is presented. A novel class of α-sulfonylamines have been suitably prepared (46–81% yield) as precursors of formal benzylidenethiourea acceptors; these are generated in situ and intercepted by N-heterocyclic carbene (NHC)-activated aldehydes affording open-chain aza-benzoin-type adducts, which in turn
Asymmetric Transfer Hydrogenation: Dynamic Kinetic Resolution of α-Amino Ketones
作者:Shweta K. Gediya、Guy J. Clarkson、Martin Wills
DOI:10.1021/acs.joc.0c01438
日期:2020.9.4
A series of α-amino ketones were reduced using asymmetrictransferhydrogenation (ATH) through a dynamic kinetic resolution (DKR). The protecting group was matched to the reducing agent, and following optimization, a series of substrates were investigated, giving products in high diastereoselectivity, over 99% ee in several cases and full conversion. The methodology was applied to the enantioselective
Synthesis of 5-thioxo-6H-imidazo[1,2-c]quinazolines and related compounds based on cyclocondensations of 2-isothiocyanatobenzonitrile (ITCB) with α-aminoketones
5-thioxo-6H-imidazo[1,2-c]quinazolines and 5-oxo-6H-imidazo[1,2-c]quinazolines were prepared by sequential reactions of α-aminoketones with 2-isothiocyanatobenzonitrile (ITCB) and 2-isocyanatobenzonitrile (ICB), respectively. The functionalization of the thioxo moiety allowed the synthesis of 5-amino-6H-imidazo[1,2-c]quinazolines and of 1,2,4-triazolo[4,3-a]-imidazo[1,2-c]quinazolines.
通过α-氨基酮与2-异硫氰酸根合苄腈(ITCB)的顺序反应制备药理学上相关的5-thioxo-6 H-咪唑并[1,2- c ]喹唑啉和5-oxo-6 H-咪唑并[1,2- c ]喹唑啉)和2-异氰酸根合苄腈(ICB)。thioxo部分的功能化可以合成5-氨基-6 H-咪唑并[1,2- c ]喹唑啉和1,2,4-三唑并[4,3- a ]-咪唑并[1,2- c ]喹唑啉。
Oxazole derivatives, their preparation and pharmaceutical compositions
申请人:Laboratoire Roger Bellon
公开号:US05403852A1
公开(公告)日:1995-04-04
Oxazole derivatives of the formula ##STR1## wherein R and R' are each hydrogen or alkyl containing 1 or 2 carbon atoms, R.sub.1 and R.sub.2 are the same or different and represent hydrogen, halogen or straight- or branched-chain (C.sub.1-4) alkyloxy radicals, and n is 3-6; their salts their isomers and mixtures and their preparation method, are method are described. These derivatives display anti-inflammatory activity.
Antiinflammatory 4,5-diaryl-2-(substituted-thio)pyrroles and their
申请人:E. I. Du Pont de Nemours and Company
公开号:US04267184A1
公开(公告)日:1981-05-12
Antiinflammatory 4,5-diaryl-2-(substituted-thio)pyrroles and their corresponding sulfoxides and sulfones, useful for treating arthritis and related diseases.