Co-reporter:Mark G. McLaughlin, Catherine A. McAdam, and Matthew J. Cook
Organic Letters 2015 Volume 17(Issue 1) pp:10-13
Publication Date(Web):December 16, 2014
DOI:10.1021/ol503065a
A rapid and stereodefined synthesis of MIDA–boryl vinylsilanes has been achieved through the hydrosilylation of an alkynylboronic ester. The E products which contain a silyl and boryl group can be selectively cross-coupled in a two-step bidirectional sequence to provide a rapid and high-yielding synthesis of complex styrenes.
Co-reporter:Jolene P. Reid, Catherine A. McAdam, Adam J. S. Johnston, Matthew N. Grayson, Jonathan M. Goodman, and Matthew J. Cook
The Journal of Organic Chemistry 2015 Volume 80(Issue 3) pp:1472-1498
Publication Date(Web):December 16, 2014
DOI:10.1021/jo502403n
Two base-mediated cascade rearrangement reactions of diallyl ethers were developed leading to selective [2,3]-Wittig–oxy-Cope and isomerization–Claisen rearrangements. Both diaryl and arylsilyl-substituted 1,3-substituted propenyl substrates were examined, and each exhibits unique reactivity and different reaction pathways. Detailed mechanistic and computational analysis was conducted, which demonstrated that the role of the base and solvent was key to the reactivity and selectivity observed. Crossover experiments also suggest that these reactions proceed with a certain degree of dissociation, and the mechanistic pathway is highly complex with multiple competing routes.
Co-reporter:Mark G. McLaughlin and Matthew J. Cook
Chemical Communications 2014 vol. 50(Issue 26) pp:3501-3504
Publication Date(Web):13 Feb 2014
DOI:10.1039/C4CC00138A
The highly syn-selective hydrosilylation of allylic alcohols was developed which, following oxidation, provided 1,3 alcohols containing two contiguous stereocentres. Through judicious choice of silane the complementary anti-selective hydrosilylation was also developed. This protocol was applied to the synthesis of an all syn polyketide stereotriad.
Co-reporter:Dr. Sanjay W. Chavhan ;Dr. Matthew J. Cook
Chemistry - A European Journal 2014 Volume 20( Issue 17) pp:4891-4895
Publication Date(Web):
DOI:10.1002/chem.201400104
Abstract
A highly regioselective allylic substitution of β-silyl allylic alcohols has been achieved that provides the branched isomer as a single product. This high level of regiocontrol is achieved through the use of a vinyl silane group that can perform a Hiyama coupling providing 1,3-disubstituted allylic amines. An unusual oxidative fragmentation product was also observed at elevated temperature that appears to proceed by a Fleming–Tamao-type oxidation–elimination pathway.
Co-reporter:Sanjay W. Chavhan, Catherine A. McAdam, and Matthew J. Cook
The Journal of Organic Chemistry 2014 Volume 79(Issue 22) pp:11234-11240
Publication Date(Web):November 3, 2014
DOI:10.1021/jo501992p
A rhenium-catalyzed N-selective allylic amination reaction of N-hydroxycarbamates has been developed. This reaction occurs with excellent N/O selectivity and with complete carbon selectivity on the allylic system. The reaction is tolerant of many functional groups and also proceeds with N-hydroxysulfonamides and hydroxamic acids.
Co-reporter:Jun Chen and Matthew J. Cook
Organic Letters 2013 Volume 15(Issue 5) pp:1088-1091
Publication Date(Web):February 19, 2013
DOI:10.1021/ol400110c
A highly efficient palladium catalyzed decarboxylative allylic rearrangement of alloc indoles has been developed. This can also be combined with a Suzuki–Miyaura cross-coupling reaction in a single pot transformation. Substituted alloc groups and benzylic variants have also been demonstrated alongside promising initial results on the enantioselective variant.
Co-reporter:Laura M. Dornan, Qun Cao, James C. A. Flanagan, James J. Crawford, Matthew J. Cook and Mark J. Muldoon
Chemical Communications 2013 vol. 49(Issue 54) pp:6030-6032
Publication Date(Web):23 May 2013
DOI:10.1039/C3CC42231C
Copper/TEMPO catalysts can be used to prepare nitriles from aldehydes or alcohols using aqueous ammonia. Readily accessible methods were developed that enable standard glassware to be used with air as the source of O2. It was further shown that, at higher temperatures in a pressurised reactor under limiting oxygen conditions (8% O2), catalyst loadings of 1 mol% could be employed.
Co-reporter:Catherine A. McAdam, Mark G. McLaughlin, Adam J. S. Johnston, Jun Chen, Magnus W. Walter and Matthew J. Cook
Organic & Biomolecular Chemistry 2013 vol. 11(Issue 27) pp:4488-4502
Publication Date(Web):10 May 2013
DOI:10.1039/C3OB40496J
A facile and user-friendly protocol has been developed for the selective synthesis of E-vinyl silanes derived from propargylic alcohols using a PtCl2/XPhos catalyst system. The reaction is generally high yielding and provides a single regioisomer at the β-position with E-alkene geometry. The reaction is extremely tolerant of functionality and has a wide scope of reactivity both in terms of alkynes and silanes used. The catalyst loading has been investigated and it is found that good reactivity is observed at extremely low catalyst loadings. This methodology has also been extended to a one-pot hydrosilylation Denmark–Hiyama coupling.
Co-reporter:Adam J. S. Johnston, Mark G. McLaughlin, Jolene P. Reid and Matthew J. Cook
Organic & Biomolecular Chemistry 2013 vol. 11(Issue 44) pp:7662-7666
Publication Date(Web):03 Oct 2013
DOI:10.1039/C3OB41857J
A base mediated isomerisation–allylation protocol of 1,3-disubstituted propenols has been established. The use of diaryl and aryl-silyl substrates is reported alongside the use of substituted allyl bromides. Mechanistic experiments have also been conducted to elucidate the reaction pathway.
Co-reporter:James C. A. Flanagan, Laura M. Dornan, Mark G. McLaughlin, Niall G. McCreanor, Matthew J. Cook and Mark J. Muldoon
Green Chemistry 2012 vol. 14(Issue 5) pp:1281-1283
Publication Date(Web):28 Feb 2012
DOI:10.1039/C2GC35062A
N-Heterocycles can be prepared using alcohol oxidation as a key synthetic step. Herein we report studies exploring the potential of Cu/TEMPO as an aerobic oxidation catalyst for the synthesis of substituted indoles and quinolines.
Co-reporter:Mark G. McLaughlin and Matthew J. Cook
The Journal of Organic Chemistry 2012 Volume 77(Issue 4) pp:2058-2063
Publication Date(Web):January 10, 2012
DOI:10.1021/jo202560g
A one-pot isomerization–Claisen protocol has been developed for the synthesis of highly substituted allylsilanes. Monosilylated divinyl ethers can be isomerized using a cationic iridium(I) catalyst followed by a thermal Claisen rearrangement to provide the allylsilanes in excellent yields and diastereoselectivities.
Co-reporter:Mark G. McLaughlin and Matthew J. Cook
Chemical Communications 2011 vol. 47(Issue 39) pp:11104-11106
Publication Date(Web):12 Sep 2011
DOI:10.1039/C1CC14433B
A highly regioselective hydrosilylation of propargylic alcohols has been developed using an in situ prepared PtCl2/XPhos catalyst system. The reaction is tolerant of many functional groups and exhibits excellent regio and geometric selectivity.
Co-reporter:Mark G. McLaughlin and Matthew J. Cook
Chemical Communications 2011 - vol. 47(Issue 39) pp:NaN11106-11106
Publication Date(Web):2011/09/12
DOI:10.1039/C1CC14433B
A highly regioselective hydrosilylation of propargylic alcohols has been developed using an in situ prepared PtCl2/XPhos catalyst system. The reaction is tolerant of many functional groups and exhibits excellent regio and geometric selectivity.
Co-reporter:Adam J. S. Johnston, Mark G. McLaughlin, Jolene P. Reid and Matthew J. Cook
Organic & Biomolecular Chemistry 2013 - vol. 11(Issue 44) pp:NaN7666-7666
Publication Date(Web):2013/10/03
DOI:10.1039/C3OB41857J
A base mediated isomerisation–allylation protocol of 1,3-disubstituted propenols has been established. The use of diaryl and aryl-silyl substrates is reported alongside the use of substituted allyl bromides. Mechanistic experiments have also been conducted to elucidate the reaction pathway.
Co-reporter:Catherine A. McAdam, Mark G. McLaughlin and Matthew J. Cook
Inorganic Chemistry Frontiers 2015 - vol. 2(Issue 5) pp:NaN514-514
Publication Date(Web):2015/03/17
DOI:10.1039/C5QO00002E
A high yielding and robust protocol for the stereodefined synthesis of 1,3-dienes has been established through a hydrosilylation–Hiyama coupling strategy. In all cases the products were formed as single E,E isomers and conditions are tolerant of a wide range of functional groups not compatible with other methods.
Co-reporter:Laura M. Dornan, Qun Cao, James C. A. Flanagan, James J. Crawford, Matthew J. Cook and Mark J. Muldoon
Chemical Communications 2013 - vol. 49(Issue 54) pp:NaN6032-6032
Publication Date(Web):2013/05/23
DOI:10.1039/C3CC42231C
Copper/TEMPO catalysts can be used to prepare nitriles from aldehydes or alcohols using aqueous ammonia. Readily accessible methods were developed that enable standard glassware to be used with air as the source of O2. It was further shown that, at higher temperatures in a pressurised reactor under limiting oxygen conditions (8% O2), catalyst loadings of 1 mol% could be employed.
Co-reporter:Catherine A. McAdam, Mark G. McLaughlin, Adam J. S. Johnston, Jun Chen, Magnus W. Walter and Matthew J. Cook
Organic & Biomolecular Chemistry 2013 - vol. 11(Issue 27) pp:NaN4502-4502
Publication Date(Web):2013/05/10
DOI:10.1039/C3OB40496J
A facile and user-friendly protocol has been developed for the selective synthesis of E-vinyl silanes derived from propargylic alcohols using a PtCl2/XPhos catalyst system. The reaction is generally high yielding and provides a single regioisomer at the β-position with E-alkene geometry. The reaction is extremely tolerant of functionality and has a wide scope of reactivity both in terms of alkynes and silanes used. The catalyst loading has been investigated and it is found that good reactivity is observed at extremely low catalyst loadings. This methodology has also been extended to a one-pot hydrosilylation Denmark–Hiyama coupling.
Co-reporter:Mark G. McLaughlin and Matthew J. Cook
Chemical Communications 2014 - vol. 50(Issue 26) pp:NaN3504-3504
Publication Date(Web):2014/02/13
DOI:10.1039/C4CC00138A
The highly syn-selective hydrosilylation of allylic alcohols was developed which, following oxidation, provided 1,3 alcohols containing two contiguous stereocentres. Through judicious choice of silane the complementary anti-selective hydrosilylation was also developed. This protocol was applied to the synthesis of an all syn polyketide stereotriad.