Iodine-Mediated C–H Functionalization of sp, sp2, and sp3 Carbon: A Unified Multisubstrate Domino Approach for Isatin Synthesis
摘要:
Molecular iodine-promoted efficient construction of isatins from 2'-aminophenylacetylenes, 2'-aminostyrenes, and 2'-amino-,beta-ketoesters is developed via oxidative amidation of sp, sp(2), and sp(3) C-H bonds. The reaction involves consecutive iodination, Kornblum oxidation, and intramolecular amidation in a single reactor. The present method meets all of the atom and redox economy principles.
Regioselective synthesis of benzazetines and indoles from o-alkenylanilides was achieved. The reaction of o-vinylbenzanilide with dimethyl(methylthio)sulfonium trifluoromethanesulfonate (DMTST) gave the corresponding benzazetine in 92% yield, whereas the reaction of o-vinyl-N-p-toluenesulfonylanilide gave N-tosylindoline in 77% yield. 3-Methy-N-p-tosylindole was directly synthesized by the reaction of o-isopropenyl-N-p-tosylanilide with dimethyl disulfide and methyl triflate in 85% yield.
Dehydrative Beckmann rearrangement and the following cascade reactions
作者:Yongjiao Wei、Yinghui Liu、Lan-Gui Xie
DOI:10.1016/j.cclet.2021.10.020
日期:2022.5
The Beckmannrearrangement has been predominantly studied for the synthesis of amide and lactam. By strategically using the in situ generated Appel's salt or Mitsunobu's zwitterionic adduct as the dehydrating agent, a series of Beckmannrearrangement and following cascade reactions have been developed herein. The protocol allows the conversion of various ketoximes into amide, thioamide, tetrazole and
Fused heterotricyclic compounds as inhibitors of 17beta-hydroxysteroid dehydrogenase 3
申请人:Gavai V. Ashvinikumar
公开号:US20050192310A1
公开(公告)日:2005-09-01
Fused heterotricyclic compounds, methods of using such compounds in the treatment of hormone sensitive diseases such as prostate cancer, and pharmaceutical compositions containing such compounds.
Development of Isomerization and Cycloisomerization with Use of a Ruthenium Hydride with <i>N</i>-Heterocyclic Carbene and Its Application to the Synthesis of Heterocycles
ruthenium hydride complex with N-heterocyclic carbene (NHC) ligand was efficiently generated from the reaction of a second-generation Grubbs ruthenium catalyst with vinyloxytrimethylsilane and unambiguously characterized. This ruthenium hydride complex showed high catalytic activity for the selective isomerization of terminal olefin and for the cycloisomerization of 1,6-dienes. These reactions of N-allyl-o-vinylaniline
第二代Grubbs钌催化剂与乙烯基氧基三甲基硅烷的反应可有效生成具有N-杂环卡宾(NHC)配体的纯氢化钌络合物,并具有明确的特征。该氢化钌络合物对末端烯烃的选择性异构化和1,6-二烯的环异构化显示出高催化活性。的这些反应Ñ -allyl- Ò -vinylaniline导致新的合成方法杂环如吲哚和3-亚甲基-2,3- dihydroindoles,这对于生物活性天然产物有用的合成子。这些程序解决了面向多样性的综合中的一个重要问题。
A new method for the generation of indole-2,3-quinodimethanes and 2-(N-alkoxycarbonylamino)-1,3-dienes. Intramolecular Heck/Diels–Alder cycloaddition cascade starting from acyclic α-phosphono enecarbamates
作者:Haruhiko Fuwa、Makoto Sasaki
DOI:10.1039/b704374k
日期:——
An intramolecular Heck/DielsâAlder cycloaddition cascade starting from acyclic α-phosphono enecarbamates has been developed to prepare nitrogen heterocycles viaindole-2,3-quinodimethanesand 2-(N-alkoxycarbonylamino)-1,3-dienes.