Insertion of 1-Chloro-1-lithioalkenes into Organozirconocenes. A Versatile Synthesis of Stereodefined Unsaturated Systems
作者:Aleksandr Kasatkin、Richard J. Whitby
DOI:10.1021/ja9910208
日期:1999.8.1
1-halo-1-lithio-1-alkenes occurs with clean inversion of configuration of the sp2-carbenoid carbon. Carbenoids derived by deprotonation of 2,2-disubstituted 1-halo-1-alkenes gave poor stereocontrol probably due to isomerization before insertion into the organozirconium species. Insertion of vinylcarbenoids into alkynylzirconocenes affords terminal (3E)- or (3Z)-1,3-dien-5-ynes, internal (1E,3Z)-1,3-dien-5-ynes
Electrophilic Cyclization of Aryldiacetylenes in the Synthesis of Functionalized Enediynes Fused to a Heterocyclic Core
作者:N. A. Danilkina、A. E. Kulyashova、A. F. Khlebnikov、S. Bräse、I. A. Balova
DOI:10.1021/jo501396s
日期:2014.10.3
variety of asymmetrically substituted acyclic enediynes fused to heterocycles. The tolerance of the developed methodology to a variety of functional groups is a great advantage in the synthesis of macrocyclic enediyne systems fused to a heterocyclic core. Synthesis of indole-fused 12-membered macrocyclic dienediyne was achieved using ring-closingmetathesis as a key step.
Synthesis and Reactivity of 3-Alkynyldihydroselenophene Derivatives
作者:Alisson R. Rosário、Ricardo F. Schumacher、Bibiana M. Gay、Paulo H. Menezes、Gilson Zeni
DOI:10.1002/ejoc.201000588
日期:2010.10
We present herein our results on the synthesis of 3-alkynyl-dihydroselenophenes by palladium-catalyzed Sonogashira cross-coupling of 3-iododihydroselenophenes with different alkynes under mild conditions in good to excellent yields. The developed protocol tolerated a wide range of functional groups in the dihydroselenophenes and alkynes. These 3-alkynyldihydroselenophenes, bearing the chalcogen group
A Convenient Synthesis of Functionalised 1-Aryl-1,3-alkadiynes
作者:Irina A. Balova、Victor N. Sorokoumov、Svetlana N. Morozkina、Olga V. Vinogradova、David W. Knight、Sergey F. Vasilevsky
DOI:10.1002/ejoc.200400688
日期:2005.3
A two-step, one-pot synthesis of functionalised 1-arylalka-1,3-diynes is described. A key feature in this approach is exploitation of the “acetylene zipper” reaction to obtain terminal 1,3-alkadiynes 3 from internal isomers 1. Without isolation, but after protonation, the 1,3-alkadiynes 3 are subjected to subsequent Pd/Cu-catalyzed Sonogashira cross-couplings with aryl iodides having both electron-withdrawing
Electrophilic Cyclization of Buta-1,3-diynylarenes: Synthesis of Precursors of (Z)-3-Ene-1,5-diyne Systems Fused to Heterocycles
作者:Stefan Bräse、Irina Balova、Natalia Danilkina
DOI:10.1055/s-0030-1259547
日期:2011.3
simple, convenient, and promising strategy for the synthesis of 2-ethynyl-3-iodo-benzothiophenes, -benzofurans, and -indoles based on electrophilic cyclization of easily available ortho- functionalized (buta-1,3-diynyl)arenes was developed. The unique potential of using these compounds as starting materials for the syn- thesis of enediyne systems, containing thiophene, furan, and pyrrole units is demonstrated