A general alkyl-alkyl cross-coupling enabled by redox-active esters and alkylzinc reagents
作者:Tian Qin、Josep Cornella、Chao Li、Lara R. Malins、Jacob T. Edwards、Shuhei Kawamura、Brad D. Maxwell、Martin D. Eastgate、Phil S. Baran
DOI:10.1126/science.aaf6123
日期:2016.5.13
carbon-carbon bonds are often the hardest to make. Most reactions owe their efficiency to neighboring double bonds or oxygen and nitrogen atoms that linger in the products. Qin et al. now present a broadlyapplicableprotocol for making C-C bonds in the absence of such surrounding help. The nickel-catalyzed process couples a zinc-activated carbon center to an ester that's poised to lose CO2. The ready availability
<i>N</i>-Hydroxyphthalimidyl diazoacetate (NHPI-DA): a modular methylene linchpin for the C–H alkylation of indoles
作者:Rajdip Chowdhury、Abraham Mendoza
DOI:10.1039/d1cc01026c
日期:——
The insertion of conventional diazocompounds into indoles are still limited by the custom carbene precursors, catalysts and manipulation of the products required. Herein, we address these shortcomings with a redox-active carbene precursor (NHPI-DA).
Bis(alk-4-enyl)zink-verbindungen durch addition von alk-2-enylzink an olefine
作者:Herbert Lehmkuhl、Ingo Döring、Hans Nehl
DOI:10.1016/s0022-328x(00)89045-2
日期:1981.12
The dialk-2-enylzinc compounds I–IV add to ethylene, oct-1-ene and 3,3-dimethylcyclopropene to give the corresponding di-alk-4-enylzinc compounds VI–IX (88–98% yield), XV and XVI (90–94% yield), XVII (7%) and XXIIIa–XXVIa (91–98% yield). Additions to XIII are regioselective with Zn → C(1) while stereoselective cis-addition to XXII is observed.
Although carbozincation of terminal alkynes is a promising method for the synthesis of alkenylzinc reagents, many challenges, especially the chemo-, regio-, and stereoselectivity, remain to be addressed. Herein we report an operationally simple, mild method for iron-catalyzed alkylzincation of terminal alkynes to produce a diverse array of alkenylzinc compounds in high yields with high anti-Markovnikov
Total Synthesis and Functional Evaluation of IORs, Sulfonolipid‐based Inhibitors of Cell Differentiation in
<i>Salpingoeca rosetta</i>
作者:Luka Raguž、Chia‐Chi Peng、Florentine U. N. Rutaganira、Thomas Krüger、Aleksa Stanišić、Theresa Jautzus、Hajo Kries、Olaf Kniemeyer、Axel A. Brakhage、Nicole King、Christine Beemelmanns
DOI:10.1002/anie.202209105
日期:2022.10.10
modular synthesis of the rosette-inhibitor sulfonolipid IOR-1A and chemicalprobes was achieved via decarboxylative cross-coupling reaction of a desymmetrized tartaric acid derivatives and alkyl zinc reagents of choice. Synthesized congeners and bifunctionalprobes allowed to determine structure-activity relation to profile binding partners in producer and recipient for the first time.