Highly Active Au(I) Catalyst for the Intramolecular <i>e</i><i>xo</i>-Hydrofunctionalization of Allenes with Carbon, Nitrogen, and Oxygen Nucleophiles
作者:Zhibin Zhang、Cong Liu、Robert E. Kinder、Xiaoqing Han、Hua Qian、Ross A. Widenhoefer
DOI:10.1021/ja062045r
日期:2006.7.19
Au-catalyzed intramolecularhydroalkoxylation within minutes at room temperature to form the corresponding oxygen heterocycles in good yield with high exo-selectivity. 2-Allenyl indoles underwent Au-catalyzed intramolecular hydroarylation within minutes at room temperature to form 4-vinyl tetrahydrocarbazoles in good yield. Au-catalyzed cyclization of N-allenyl carbamates, allenyl alcohols, and 2-allenyl
The boraformylation of allenes with B2(pin)2 and a formate ester as boron and formyl source, respectively, proceeds in the presence of a copper catalyst. The reaction selectively affords the corresponding β‐boryl β,γ‐unsaturated aldehydes in good to high yields. Furthermore, the silaformylation of allenes was achieved with a formate ester and PhMe2Si−B(pin) as the silicon source.
Evidence for concerted processes in the course of the homoallenylic transposition
作者:Chahinez Aouf、Nicolas Galy、Maurice Santelli
DOI:10.1016/j.tet.2013.02.048
日期:2013.4
The hydrolysis of β-allenic tosylates produces mainly 2-methylenecyclobutanols resulting from a homoallenylic participation along with isomeric 2-methylenecyclobutanol minor products coming from a 1234–1243 rearrangement. Structures of various cyclopropylvinyl carbocations involved in the course of the hydrolysis have been determined by computational studies. For acyclic tosylates, the hydrolysis of
作者:Gérard Gil、Elisée Ferre、Michel Barre、Jean Le Petit
DOI:10.1016/s0040-4039(00)82117-6
日期:1988.1
α-Allenic alcohols are reduced by into the corresponding β-ethylenic alcohols whereas β-allenic alcohols undergo an isomerization leading to their γ -acetylenic counterparts.
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.