Iminium ion and acyliminium ion initiated cyclization reactions of vinylsilanes. Regiocontrolled synthesis of tetrahydropyridines and related heterocycles
new approach to the synthesis of quinolizidines involving a cascade of nucleophilic cyclizations triggered by chemoselective amide activation is reported. Particular attention was given to the effect of the nature of the tethered nucleophiles on the cascade of cyclizations. As a result, simple acyclic amides gave rapid access to functionalized quinolizidines bearing either a tertiary or quaternary center
The Asymmetric Aza-silyl-Prins Reaction: Synthesis of Enantiopure Piperidines
作者:Ramana R. Mittapalli、Sebastien J. J. Guesné、Robert J. Parker、Wim T. Klooster、Simon J. Coles、John Skidmore、Adrian P. Dobbs
DOI:10.1021/acs.orglett.8b03283
日期:2019.1.18
The design and development of the first asymmetric aza-silyl-Prins reaction is reported, giving rise to valuable and diverse piperidines and pipecolic acid derivatives in both high yields and as single enantiomers. The creation of a novel chiral auxiliary-homoallylic amine for the aza-silyl-Prins reaction is essential to its success.
The Aza-Silyl-Prins Reaction: A Novel Method for the Synthesis of<i>Trans-</i>2,6-Tetrahydropyridines
作者:Adrian P. Dobbs、Sebastien J. Guesné、Michael B. Hursthouse、Simon J. Coles
DOI:10.1055/s-2003-41434
日期:——
Reaction of 4-trimethylsilyl-3-butenyl-1-amines with aldehydes under mild Lewis acid conditions gives substituted tetrahydropyridines in excellent yields and with excellent trans diastereoselectivity.
A Versatile Indium Trichloride Mediated Prins-Type Reaction to Unsaturated Heterocycles
作者:Adrian P. Dobbs、Sebastien J. J. Guesné、Saša Martinović、Simon J. Coles、Michael B. Hursthouse
DOI:10.1021/jo034981k
日期:2003.10.1
A versatile and high-yielding indium trichloride mediated cyclization reaction of silylated homoallylic alcohols, thiols, or amines with aldehydes or epoxides is described as a rapid route to a range of unsaturated heterocycles. The excellent diastereoselectivity observed offers a method of wide scope and generality.
Configuration-Dependent Ring Opening of Silyloxiranes: Synthesis of Functionalized Alkenes or Tetrahydrofurans
作者:Jens Lange、Ernst Schaumann
DOI:10.1002/ejoc.200900448
日期:2009.9
cis- and trans-Silyloxiranes with a potential tosylate or bromide leaving group in the β position are available by the diastereospecific reduction of the corresponding alkynes with DIBAL-H and hydrosilylation with silanes, respectively. In the reaction with the anion of a silylthioacetal, the outcome of the reaction is configuration dependent: the cis-oxiranes add nucleophilic methanthiolate and give