Regio- and Stereoselective Au(I)-Catalyzed Intermolecular Hydroalkoxylation of Aryl Allenes
作者:Dong-Mei Cui、Chen Zhang、Ke-Rui Yu
DOI:10.1055/s-0028-1088158
日期:2009.4
In the presence of a catalytic amount of Ph3PAuNO3 and H2SO4, the hydroalkoxylation of allenes with alcohols has been shown to proceed smoothly and give allylic ethers in good yields and high regio- and stereoselectivity.
On the Reduction of α,β-Unsaturated (Group 6) Carbene Complexes by NaBH 4 1
作者:Mar Gómez-Gallego、Marı́a J Mancheño、Pedro Ramı́rez、Carmen Piñar、Miguel A Sierra
DOI:10.1016/s0040-4020(00)00204-0
日期:2000.7
Chromium and tungsten styryl Fischer carbene complexes 12 and 15 were transformed into Z-vinyl ether 13 and E-allyl ether 14 by NaBH4 reduction in EtOH. Deuterium labeling experiments demonstrate that the reaction occurs by the initial addition of the hydride to the carbene carbon atom, followed by a 1,3-rearrangement of the M(CO)(5) fragment. The process could involve the participation of an eta(3)-allyl chromium intermediate. The reaction is general and has been applied to a series of alpha,beta-unsaturated alkoxy and aminocarbene complexes. In the case of chromium and tungsten alkynyl carbenes 38 and 39, NaBH4 reduction exclusively yields E-allyl ether 14. The intermediacy of an allenyl complex 41 obtained after the 1,3-rearrangement of the metal center is confirmed by deuterium labeling experiments. (C) 2000 Elsevier Science Ltd. All rights reserved.
US3943943A
申请人:——
公开号:US3943943A
公开(公告)日:1976-03-16
US4052993A
申请人:——
公开号:US4052993A
公开(公告)日:1977-10-11
Palladium-catalyzed allylic C–H oxidation under simple operation and mild conditions
作者:Yunlong Guo、Zengming Shen
DOI:10.1039/c9ob00209j
日期:——
alcohols through Pd-catalyzed allylic C–H bond functionalization. This approach exhibits advantages due to its simple operation, mildconditions, and environmentally benign features. By modifying reaction conditions, it can be suitable for preparing unsaturated aldehydes, allylic esters, ethers, and amines.
我们发现了一种有效且简单的系统(Pd / BQ / air / rt),可通过Pd催化的烯丙基CH键与H键官能化来制备烯丙基醇。该方法具有操作简单,条件温和和环境友好等优点,因此具有优势。通过改变反应条件,它可以适用于制备不饱和醛,烯丙基酯,醚和胺。