作者:Samantha A. Green、Jeishla L. M. Matos、Akiko Yagi、Ryan A. Shenvi
DOI:10.1021/jacs.6b08507
日期:2016.10.5
A combination of cobalt and nickel catalytic cycles enables a highly branch-selective (Markovnikov) olefin hydroarylation. Radical cyclization and ring scission experiments are consistent with hydrogenatomtransfer (HAT) generation of a carbon-centered radical that leads to engagement of a nickel cycle.
C–H to C–N Cross-Coupling of Sulfonamides with Olefins
作者:Rulin Ma、M. Christina White
DOI:10.1021/jacs.7b13492
日期:2018.3.7
coupling conditions stands to significantly impact chemical synthesis. Herein, we disclose a C(sp3)-N fragment coupling reaction between terminalolefins and N-triflyl protected aliphatic and aromatic amines via Pd(II)/SOX (sulfoxide-oxazoline) catalyzed intermolecular allylic C-H amination. A range of (56) allylic amines are furnished in good yields (avg. 75%) and excellent regio- and stereoselectivity
Chiral discrimination of saturatedhydrocarbons has been very difficult to establish, or has not been possible at all. The first chiral discrimination of cryptochiral 5-ethyl-5-propylundecane 1, that is, (n-butyl)ethyl(n-hexyl)(n-propyl)methane, a chiral saturated quaternary hydrocarbon, which is known to exhibit practically no detectable value of optical rotation between 280 and 580 nm, has been accomplished
Synthesis of Secondary and Tertiary Alkylboranes via Formal Hydroboration of Terminal and 1,1-Disubstituted Alkenes
作者:Hilary A. Kerchner、John Montgomery
DOI:10.1021/acs.orglett.6b03090
日期:2016.11.4
terminal or 1,1-disubstituted alkenes with bis(pinacolato)diboron and methanol provides formal hydroboration products with exceptional regiocontrol favoring the branched isomer. Pairing this procedure with photocatalytic cross-couplings using iridium and nickel cocatalysis provides an effective, highlyregioselective procedure for the hydroarylation of terminal alkenes.
Luteolide is a 10-membered aliphatic macrolactone, (4R,8S,9S)-4,8-dimethylundecan-9-olide ((−)-17), released by the femoral gland of males of the mantellid frog Gephyromantis luteus. Its structure was established using NMR, MS, and chiral GC and confirmed by stereoselectivesynthesis of different stereoisomers. Among the approximately 20 current macrolides known from the Mantellidae, luteolide is the