2-c]thiazol]-2-one have been achieved through1,3-dipolarcycloaddition. Intermediate azomethine ylides generated in situ from α-amino acids and acenaphthylene-1,2-dione react with α-aroylidine ketenedithioacetal (AKDTA) derivatives to give the target product in excellent yield underultrasoundirradiation. Further, spiro-S,S-acetals are converted to spiro-2H-pyranones by a one-pot cyclization strategy.
新型螺[[-1,3'-吡咯烷] -2-一和螺[ac-1,5'-吡咯并[1,2- c ]噻唑] -2-的文库的立体/区域/化学选择性合成一种是通过1,3-偶极环加成反应实现的。由α-氨基酸和1,2-二酮原位产生的中间体甲亚胺基亚烷基与α-芳基亚乙基酮二硫缩醛(AKDTA)衍生物反应,在超声波照射下以优异的收率得到目标产物。此外,通过一锅环化策略将螺-S,S-乙缩醛转化为螺-2 H-吡喃酮。
One-pot chemo/regio/stereoselective generation of a library of functionalized spiro-oxindoles/pyrrolizines/pyrrolidines from α-aroylidineketene dithioacetals
An efficient chemo/regio/stereoselective synthesis of novel and functionalized spiro-oxindole/pyrrolizine/pyrrolidine scaffolds has been achieved.
一种高效的新型和功能化的螺环氧吲哚/吡咯烷/吡咯啉骨架的化学/位置/立体选择性合成已经实现。
Indium(III) Chloride Mediated Michael Addition of Indoles to Ketene S,S-Acetals: Synthesis of Bis- and Tris-indolylketones
作者:Thokchom Prasanta Singh、Ruhima Khan、Young Ri Noh、Sang-Gyeong Lee、Okram Mukherjee Singh
DOI:10.5012/bkcs.2014.35.10.2950
日期:2014.10.20
A series of bis and tris-indolylketones and meridianin alkaloids are prepared by one pot Michael reaction of indole and ketene S,S-acetals under solvent-free condition using mild Lewis acid $InCl_3$.
一系列的双和三吲哚基酮及经线碱类化合物是通过在无溶剂条件下,利用温和的 Lewis 酸 $InCl_3$,将吲哚与亚硫酸酯酮进行一锅 Michael 反应制备而成的。
Amide Bond Formation Assisted by Vicinal Alkylthio Migration in Enaminones: Metal- and CO-Free Synthesis of α,β-Unsaturated Amides
S-acetals) under mild conditions. Simple treatment of such enaminones with PhI(OAc)2 at ambient temperature in air afforded diverse multiply functionalized α,β-unsaturatedamides including β-cyclopropylated acrylamides, in which a wide array of functional groups such as aryl, (hetero)aryl, alkenyl, and alkyl can be conveniently introduced to a ketene moiety. The reaction mechanism was investigated by exploring