Generation of Organolithium Compounds bearing Super Silyl Ester and their Application to Matteson Rearrangement
作者:Susumu Oda、Hisashi Yamamoto
DOI:10.1002/anie.201304225
日期:2013.7.29
It's super‐silyl‐fragilithyl‐ester‐aryl‐docious: The super silylgroup is a strong protecting group for carboxylic acids and provides a method for direct lithiation that is compatible with the ester moiety. Organolithium compounds bearing a super silyl ester react with a variety of electrophiles in high yields (see scheme). The reaction of lithiated super silyl chloroacetate with a boron compound gives
Tandem Addition/Cyclization Reaction of Organozinc Reagents to 2-Alkynyl Aldehydes: Highly Efficient Regio- and Enantioselective Synthesis of 1,3-Dihydroisobenzofurans and Tetrasubstituted Furans
作者:Zhuo Chai、Zheng-Feng Xie、Xin-Yuan Liu、Gang Zhao、Ji-De Wang
DOI:10.1021/jo800029m
日期:2008.4.1
The enantioselectiveaddition of organozinc reagents to some 2-alkynyl benzaldehydes and the subsequent regioselective cyclization step was performed in one pot to form chiral 1,3-dihydroisobenzofurans with good product yields and excellent regio- and enantioselectivities. In the case of 2-alkynylcycloalkene aldehydes, tetrasubstituted furans were obtained in good product yields through a 1, 5-hydride
Nickel-catalysed addition of organoboronates to 1,3-dienesElectronic supplementary information (ESI) available: 1H NMR spectra and MS data. See http://www.rsc.org/suppdata/cc/b2/b207185a/
Aryl- and alkenylboronates were found to add to 1,3-dienes in the presence of a catalytic amount of bis(1,5-cyclooctadiene)nickel, where a proton source in combination with a solvent considerably controls the regioselectivity.
A Ni(cod)2–aminophosphine complex catalyzed the addition of aryl- and alkenylboronates to 1,2-dienes to give the hydroarylation and hydroalkenylation products of the 1,2-dienes, whereas the hydroarylation products of a 1,2-diene and an alkyne were obtained with a Ni(cod)2–PPh3 catalyst.
Copper(<scp>i</scp>)-catalyzed amidation reaction of organoboronic esters and isocyanates
作者:Tedrick Thomas Salim Lew、Diane Shu Wen Lim、Yugen Zhang
DOI:10.1039/c5gc01374g
日期:——
A simple and efficient methodology for the preparation of amides from easily available organoboronic esters and isocyanates has been accomplished using ligand-free copper(I) catalyst. The reaction system demonstrated broad substrate...