A 4-acylaminopyrazole derivative represented by the following general formula:
wherein R1 is a hydrogen atom, an optionally substituted C1-C16 alkyl group or the like,
R2 and R3 are independently a hydrogen atom, a halogen atom, an optionally substituted C1-C6 alkyl group or the like,
R4 is a hydrogen atom, a C1-C6 alkyl group or a cyano group,
Z is an oxygen atom or a sulfur atom,
Ar is an optionally substituted C6-C14 aryl group or an optionally substituted 5-6 membered unsaturated heterocyclic group,
B is a hydrogen atom, a halogen atom, an optionally substituted C1-C16 alkyl group or the like.
由以下通式代表的 4-酰氨基吡唑衍生物:
其中 R1 是氢原子、任选取代的 C1-C16 烷基或类似基团、
R2 和 R3 独立地为氢原子、卤素原子、任选取代的 C1-C6 烷基或类似基团、
R4 是氢原子、C1-C6 烷基或氰基、
Z 是氧原子或硫原子、
Ar 是任选取代的 C6-C14 芳基或任选取代的 5-6 位元不饱和杂环基团、
B 是氢原子、卤素原子、任选取代的 C1-C16 烷基或类似基团。
Synthesis of Tri- and Tetrasubstituted Furans Catalyzed by Trifluoroacetic Acid
作者:Frédéric Stauffer、Reinhard Neier
DOI:10.1021/ol0063205
日期:2000.11.1
[GRAPHICS]Substituted 2-hydroxy-3-acetylfurans are synthesized by alkylation of tert-butyl acetoacetate with an alpha -haloketone followed by treatment of the obtained intermediate with trifluoroacetic acid (TFA). A second alkylation of the intermediate followed by treatment with trifluoroacetic acid provides access to disubstituted 2-methylfurans.
Total Synthesis of Catunaregin and Preliminary Evaluation of Its Antitumor Activity
作者:Hideki Abe、Takuma Hikichi、Kosuke Emori、Akihito Yokosuka、Yoshihiro Mimaki、Toyoharu Kobayashi、Hisanaka Ito
DOI:10.1002/ejoc.201800219
日期:2018.4.17
The totalsynthesis of catunaregin in both racemic and optically active forms was accomplished. The enantioselective synthesis uses the Evans aldol strategy, with an oxazolidinone or thiazolidinethione as the chiral auxiliary. The key features include a syn‐selective aldol reaction to form the Evans‐syn or non‐Evans‐syn product, and a successive ketalization reaction of a furanyl diol derivative under