A convenient and efficient visible-light-induced tandem acylation/cyclization of N-propargylindoles with aryl- or alkyl-substituted acyl oxime esters for the synthesis of 2-acyl-substituted 9H-pyrrolo[1,2-a]indoles under transition-metal-free conditions, which proceeds via nitrogen-centered radical-mediated cleavage of the C–C σ-bond in acyl oxime esters, is established. The aryl or alkylacyl radicals
N-炔丙基吲哚与芳基-或烷基-取代的酰基肟酯的方便有效的可见光诱导串联酰化/环化,用于合成2-酰基-取代的9 H-吡咯并[1,2- a ]吲哚过渡建立了无金属条件,该条件通过氮中心自由基介导的酰基肟酯中 C-C σ 键的裂解进行。来自酰基肟酯的芳基或烷基酰基自由基攻击N-炔丙基吲哚中的 C-C 三键,然后进行分子内环化/异构化。
Synthesis and application of a novel coupling reagent, ethyl 1-hydroxy-1H -1,2,3-triazole-4-carboxylate
coupling reagent, ethyl 1-hydroxy-1H-1,2,3-triazole-4-carboxylate (HOCt), has been designed and synthesised for application to solid phase peptide synthesis using Fmoc chemistry. It is used in combination with carbodiimidereagents, has very high coupling efficiency, and does not absorb at 302nm, thus allowing real-time monitoring of each coupling cycle. Its applications in the synthesis of endothelin
Henry reaction of in situ generated nitrosocarbonyl intermediates and concomitant denitration cascade has been developed. The reaction is catalyzed by organic base at room temperature offering α-ketoamides, a demanding scaffold for drug discovery, in high yields. An alteration of substitution pattern also produced α-keto oximes, a high-value synthon. The protocol features operational simplicity and broad
Triazine derivatives, processes for preparation thereof and pharmaceutical compositions comprising the same
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP0077983A1
公开(公告)日:1983-05-04
New triazine derivatives represented by the formula:
wherein
R1 is aryl, pyridyl, thienyl, 1,2,3,4-tetrahydroquinolyl or 1,3,4,5-tetrahydro-2H-1-benzazepinyl, optionally substituted with lower alkyl, lower alkoxy, halogen, nitro or oxo;
R2 is hydrogen, lower alkyl or carbamoyl substituted with lower alkyl or ar(lower)alkyl; and
Z is a group selected from
and pharmaceutically acceptable salt thereof, processes for preparation thereof and pharmaceutical compositions comprising the same.
由以下式子表示的新型三嗪衍生物
其中
R1 是芳基、吡啶基、噻吩基、1,2,3,4-四氢喹喔啉基或 1,3,4,5-四氢-2H-1-苯并氮杂卓基,可选择被低级烷基、低级烷氧基、卤素、硝基或氧代取代;
R2 是氢、低级烷基或被低级烷基或芳基(低级)烷基取代的氨基甲酰基;以及
Z 是选自以下的基团
及其药学上可接受的盐、制备工艺和包含这些物质的药物组合物。
Synthesis of new beta-lactams
申请人:PHARMACHEMIE B.V.
公开号:EP0933360A1
公开(公告)日:1999-08-04
The object of the present invention is the development of new chiral auxiliaries for improved β-lactam formation that control both the diastereoselectivity of β-lactam formation and which can be removed without destruction of the sensitive azetidinone ring, providing valuable intermediates for coupling to the C-13 hydroxyl group of anti-tumour taxanes, such as paclitaxel.
Further, the object of the present invention is enantiomerically pure (S)-(-)-1-(p-methoxy-phenyl)propyl-1-amine.