Gold(I)-catalysed synthesis of cyclic sulfamidates: current scope, stereochemistry and competing ene-allene cycloisomerisation
作者:Mari C.M. Higginbotham、Lorna Kennedy、Anita G. Lindsay、Andreas Troester、Magnus W.P. Bebbington
DOI:10.1016/j.tet.2014.11.058
日期:2015.1
Six-membered cyclic sulfamidates are prepared in high yields by treatment of allenic sulfamates with readily available Ph3PAuNTf2. The reaction enables formation of N-substituted quaternary centres in high yields. The relative stereochemistry has been unambiguously determined. A π-rearrangement is faster than hydroamination in the case of an allyl-substituted sulfamate and a mechanism is proposed for
Prop-2-ynyl- and propadienyl-lithium reagents. Regiocontrolled synthesis of allenic compounds
作者:Chanh Huynh、G�rard Linstrumelle
DOI:10.1039/c39830001133
日期:——
Direct proof for the rearrangement of the prop-2-ynyl-lithium (2) into the propadienyl-lithium (4) is provided by the formation of the 1,3-disubstituted alleniccompounds(7).
HUYNK, CHANH;LINSTRUMELLE, G., J. CHEM. SOC. CHEM. COMMUN., 1983, N 20, 1133-1134
作者:HUYNK, CHANH、LINSTRUMELLE, G.
DOI:——
日期:——
Novozym 435-catalyzed kinetic resolution of β-allenols. A facile route for the preparation of optically active β-allenols or allenyl acetates
作者:Daiwang Xu、Zhan Lu、Zuyi Li、Shengming Ma
DOI:10.1016/j.tet.2004.09.103
日期:2004.12
A variety of opticallyactive β-allenols and β-allenyl acetates were synthesized via the Novozym 435-mediated kineticresolution of racemic β-allenols. A dramatic solvent effect was observed for the stereoselectivity. The scope of the substrates and the effect of the concentration and temperature on the reaction were also investigated.