Silicon-directed Norrish type I cleavage of β-trimethylsilyl cycloalkanones
作者:Jih Ru Hwu、Bryant A. Gilbert、Lung Ching Lin、Ben Ruey Liaw
DOI:10.1039/c39900000161
日期:——
The Me3Si group in β-trimethylsilylcycloalkanones was able to direct the NorrishtypeIcleavage by providing regioselectivity in the C-1-C-2 bond cleavage and by increasing the quantum yield and the reaction rate.
Asymmetric catalysis. Asymmetric catalytic intramolocular hydrosilation and hydroacylation
作者:Richard W. Barnhart、Xianqi Wang、Pedro Noheda、Steven H. Bergens、John Whelan、B. Bosnich
DOI:10.1016/s0040-4020(01)89370-4
日期:1994.4
type [Rh(chiral Diphosphine)]+ efficiently catalyse the intramolecular hydrosilation of silylethers derived fromallylicalcohol. The products can be converted to chiral 1,3-dols. High enantiomeric excesses (ee's) are observed for substrates bearing an aryl group at the olefin terminus. These same catalyst produce chiral cyclopentanones from 4-substitued 4-pentenals. Tertiary acyl and ester substituents
Ruthenium-catalysed coupling of allyl alcohol with alkynes: A new route to γ,δ-unsaturated acetals and aldehydes
作者:Sylvie Dérien、Dominique Jan、Pierre H. Dixneuf
DOI:10.1016/0040-4020(96)00185-8
日期:1996.4
γ,δ-Unsaturated acetals and aldehydes have been obtained via a new ruthenium-catalysed coupling of allylalcohol with alkynes. The branched isomer is regioselectively formed. Comparative studies of catalyst precursors have shown that (C5Me5)Ru(IV) derivatives favours the formation of acetals and that, with (C5Me5)Ru(II) moieties, the reaction can be carried out either in water or without solvent at
通过新的钌催化的烯丙醇与烯丙醇的偶合反应,获得了γ,δ-不饱和缩醛和醛。支链异构体是区域选择性形成的。催化剂前体的比较研究表明,(C 5 Me 5)Ru(IV)衍生物有利于缩醛的形成,并且对于(C 5 Me 5)Ru(II)部分,该反应既可以在水中进行,也可以在水中进行。在室温下无需溶剂。
Total synthesis of (-)-laurenyne. Use of acetal-initiated cyclizations to prepare functionalized eight-membered cyclic ethers
作者:Larry E. Overman、Andrew S. Thompson
DOI:10.1021/ja00215a040
日期:1988.3
Atom-Efficient Assembly of 1,5-Oxygen-Bridged Medium-Sized Carbocycles by Sequential Combination of a Ru-Catalyzed Alkyne−Alkene Coupling and a <i>Prins</i>-Type Cyclization
作者:Fernando López、Luis Castedo、José L. Mascareñas
DOI:10.1021/ja017804e
日期:2002.4.1
Ruthenium-catalyzed coupling of readily accessible 1-trimethylsilyl-1-alkyn-3-ols to allyl ethyl ether followed by in situ ketalization and Lewis-acid induced cyclization affords 1,5-oxygen-bridged eight- and nine-membered carbocycles, products which are difficult to construct with previously published strategies.