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.
Single electron transfer induced elemental steps in the transformation of iodomalonic esters and related CH-acids under solid-liquid PTC conditions. Preparation of electrophilic cyclopropanes
作者:László Tőke、Zoltán Hell、Gábor T. Szabó、Gábor Tóth、Mária Bihari、Antal Rockenbauer
DOI:10.1016/s0040-4020(01)81878-0
日期:1993.6.4
Single electron transfer induced elemental steps have been shown to occur during the transformation of iodomalonic esters and related CH-acids to cyclopropane derivatives undersolid-liquid phase transfer catalytic conditions. The iodo derivatives are formed from iodine and CH-acids “in situ”, in the same pot in which the transformations to cyclopropane derivatives take place. A number of electrophilic
Continuous Processing and Efficient<i>in Situ</i>Reaction Monitoring of a Hypervalent Iodine(III) Mediated Cyclopropanation Using Benchtop NMR Spectroscopy
作者:Batool Ahmed-Omer、Eric Sliwinski、John P. Cerroti、Steven V. Ley
DOI:10.1021/acs.oprd.6b00177
日期:2016.9.16
Real-time NMRspectroscopy has proven to be a rapid and an effective monitoring tool to study the hypervalent iodine(III) mediated cyclopropanation. With the ever increasing number of new synthetic methods for carbon–carbon bond formation, the NMR in situ monitoring of reactions is becoming a highly desirable enabling method. In this study, we have demonstrated the versatility of benchtop NMRusing inline
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
Hypoiodite-Mediated Catalytic Cyclopropanation of Alkenes with Malononitrile
作者:Akira Yoshimura、T. Nicholas Jones、Mekhman S. Yusubov、Viktor V. Zhdankin
DOI:10.1002/adsc.201400627
日期:2014.11.3
AbstractAn efficient synthetic procedure for dicyano‐cyclopropanation of alkenes using catalytic amounts of molecular iodine as a precatalyst and tert‐butyl hydroperoxide (TBHP) as a terminal oxidant under mild conditions has been developed. This catalytic reaction works especially well for the aryl‐substituted double bond affording products of cyclopropanation in high yields. A catalytic cycle based on the generated in situ hypoiodite species has been proposed.magnified image