Platinum catalysed hydrosilylation of propargylic alcohols
作者:Catherine A. McAdam、Mark G. McLaughlin、Adam J. S. Johnston、Jun Chen、Magnus W. Walter、Matthew J. Cook
DOI:10.1039/c3ob40496j
日期:——
A facile and user-friendly protocol has been developed for the selective synthesis of E-vinyl silanes derived from propargylicalcohols 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
Base-Mediated Cascade Rearrangements of Aryl-Substituted Diallyl Ethers
作者:Jolene P. Reid、Catherine A. McAdam、Adam J. S. Johnston、Matthew N. Grayson、Jonathan M. Goodman、Matthew J. Cook
DOI:10.1021/jo502403n
日期:2015.2.6
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
Silicon-Directed Rhenium-Catalyzed Allylic Substitutions with <i>N</i>-Hydroxycarbamates, <i>N</i>-Hydroxysulfonamides, and Hydroxamic Acids
作者:Sanjay W. Chavhan、Catherine A. McAdam、Matthew J. Cook
DOI:10.1021/jo501992p
日期:2014.11.21
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.
Silicon-Directed Rhenium-Catalyzed Allylic Carbaminations and Oxidative Fragmentations of γ-Silyl Allylic Alcohols
作者:Sanjay W. Chavhan、Matthew J. Cook
DOI:10.1002/chem.201400104
日期:2014.4.22
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
Synthesis of Diverse Allylsilanes Employing Brønsted Acid Catalyzed Reductive Functionalization
作者:Elisabeth L. R. Leonard、Geoffrey R. Akien、Thomas K. Britten、Nahin Kazi、Dean D. Roberts、Mark G. McLaughlin
DOI:10.1002/adsc.202300917
日期:2023.11.21
We present a rapid (0.25–1 h), method to produce functionalised allylsilanes from readily available vinylsilanes. Employing a Brønsted acid catalysed dehydration as the key step, allylsilanes are produced in good yields (22–98%) and, in most cases, as a single geometric isomer. Furthermore, a possible allylation-Cope pathway was discovered for certain substrates and attempts to optimise this are described