From Quaternary Carbon to Tertiary C(sp3)–Si and C(sp3)–Ge Bonds: Decyanative Coupling of Malononitriles with Chlorosilanes and Chlorogermanes Enabled by Ni/Ti Dual Catalysis
作者:Akira Yoshimura、Steven R. Koski、Brent J. Kastern、Jonathan M. Fuchs、T. Nicholas Jones、Roza Y. Yusubova、Victor N. Nemykin、Viktor V. Zhdankin
DOI:10.1002/chem.201402372
日期:2014.5.12
An efficient, transition metal‐free procedure for the cyclopropanation of alkenes using malononitrile and the LiI‐tBuOCl combination under mild reaction conditions is described. The reaction mechanism most likely involves tBuOI generated in situ from LiI and tBuOCl. The utility of this new methodology has been demonstrated by the synthesis of a potential HIV‐1 RT inhibitor.
Sequential ATRA/Reductive Cyclopropanation Reactions with a Ruthenium Catalyst in the Presence of Manganese
作者:Mariano A. Fernández-Zúmel、Charlotte Buron、Kay Severin
DOI:10.1002/ejoc.201100175
日期:2011.4
addition (ATRA) reactions of ethyl trichloroacetate, dichloromalononitrile, or diethyl 2,2-dichloromalonate with olefins followed by dechlorination have provided functionalized cyclopropanes in one step. The RuIII complex [Cp*RuCl2(PPh3)] was used as a catalyst precursor and commercial Mn powder as reducing agent. Reactions with the less activated substrate ethyl dichloroacetate gave ATRA products with
dioxygenation and diamination of alkenes have been previously developed. In this study, the potential application of hypervalent iodine(III) reagent was successfully extended to the dialkylation and cyclopropa(e)nation of unsaturated alkenes and alkynes. The reactions of alkenes with malononitrile and other active methylene compounds as the carbon nucleophiles give access to multisubstituted cyclopropane
From Quaternary Carbon to Tertiary C(sp<sup>3</sup>)–Si and C(sp<sup>3</sup>)–Ge Bonds: Decyanative Coupling of Malononitriles with Chlorosilanes and Chlorogermanes Enabled by Ni/Ti Dual Catalysis
作者:Zi-Hao Chen、Yu-Qing Zheng、Hong-Gui Huang、Ke-Hao Wang、Jun-Lin Gong、Wen-Bo Liu