Application of Cp<sub>2</sub>TiCl-Promoted Radical-Induced Cyclization: An Expeditious Access to [<i>a</i>]-Annelated Indoles
作者:Hina P. A. Khan、Tushar Kanti Chakraborty
DOI:10.1021/acs.joc.0c00817
日期:2020.6.19
An efficient and novel route for assembling pyrrolo/piperido[1,2-a]indoles is portrayed involving a radical-mediated reductive epoxide opening reaction of N-tethered epoxy-indoles that trigger facile intramolecular cyclization followed by an oxidative quenching step. Capitalizing on the operational simplicity of the method involving just two steps and use of an efficient C–C bond-forming reaction,
描绘了一种高效且新颖的组装吡咯并/哌啶并[1,2- a ]吲哚的方法,该方法涉及自由基介导的N-束缚的环氧吲哚的还原性环氧开环反应,该反应触发容易的分子内环化,然后进行氧化猝灭步骤。利用仅涉及两个步骤的方法的操作简便性,并利用有效的C–C键形成反应,该基于自由基的协议使具有重要功能和结构多样性的一类重要的N稠合吲哚衍生物得以模块化组装。
Direct formation of epoxyalkylcopper reagents from activated copper and epoxyalkyl bromides and their intranolecular cyclizations
作者:Tse-Chong Wu、Reuben D Rieke
DOI:10.1016/s0040-4039(00)82446-6
日期:——
Epoxyalkylcopper compounds have readily been prepared by the directoxidativeaddition of active copper to epoxyalkyl halides. The intramolecular cyclization of the epoxyalkylcopper reagents via an epoxide cleavage process is described. Significantly, many functional groups can be present in the bromoepoxides yielding highly functionalized carbocycles. The regioselectivity of this cyclization is affected
Direct formation and reaction of thienyl-based organocopper reagents
作者:Reuben D. Rieke、Walter R. Klein、Tse Chong Wu
DOI:10.1021/jo00061a024
日期:1993.4
The preparation of a highly reactive zerovalent copper complex by the direct reduction of lithium (2-thienylcyano)cuprate with preformed lithium naphthalenide is described. This active copper species oxidatively adds to carbon-halogen bonds to form organocopper reagents. The ability to directly form the organocopper reagent from organic halides and active copper allows for the incorporation of a wide variety of functionalities to be present in the organic halides and the organocopper reagents. Significantly, this formulation of active copper was able to oxidatively add to allyl chlorides and acetates at low temperatures to allow the direct formation of allylic organocopper reagents without Wurtz-type homocoupling. These functionalized organocopper compounds are able to undergo a variety of reactions, such as cross-coupling with acid chlorides, 1,4-conjugate addition with alpha,beta-unsaturated carbonyl compounds, and intermolecular and intramolecular epoxide-opening reactions. Subsequently, this copper species avoids the use of phosphine ligands affording the product isolation much more convenient than with phosphine-based organocopper reagents.
Rieke, Reuben D.; Wu, Tse-Chong; Stinn, Dean E., Synthetic Communications, 1989, vol. 19, # 11-12, p. 1833 - 1840
作者:Rieke, Reuben D.、Wu, Tse-Chong、Stinn, Dean E.、Wehmeyer, Richard M.
DOI:——
日期:——
RIEKE, REUBEN D.;WEHMEYER, RICHARD M.;WU, TSE-CHONG;EBERT, GREG W., TETRAHEDRON, 45,(1989) N, C. 443-454
作者:RIEKE, REUBEN D.、WEHMEYER, RICHARD M.、WU, TSE-CHONG、EBERT, GREG W.