Synthesis of Isoquinuclidines from Highly Substituted Dihydropyridines via the Diels–Alder Reaction
作者:Rhia M. Martin、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ol303040r
日期:2013.2.1
A stereo- and regioselective Diels–Alderreaction for the synthesis of highly substituted isoquinuclidines from dihydropyridines and electron-deficient alkenes has been developed. While reactions with activated dienophiles proceed readily under thermal conditions, the use of Lewis acid additives is necessary to facilitate cycloadditions for less reactive alkenes. This procedure affords the target compounds
Regio- and Stereoselective 1,2-Dihydropyridine Alkylation/Addition Sequence for the Synthesis of Piperidines with Quaternary Centers
作者:Simon Duttwyler、Shuming Chen、Colin Lu、Brandon Q. Mercado、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1002/anie.201310517
日期:2014.4.7
example of C alkylation of 1,2‐dihydropyridines with alkyl triflates and Michael acceptors was developed to introduce quaternary carbon centers with high regio‐ and diastereoselectivity. Hydride or carbon nucleophile addition to the resultant iminium ion also proceeded with high diastereoselectivity. Carbon nucleophile addition results in an unprecedented level of substitution to provide piperidine rings
开发了 1,2-二氢吡啶与烷基三氟甲磺酸酯和迈克尔受体的 C 烷基化的第一个例子,以引入具有高区域选择性和非对映选择性的季碳中心。氢化物或碳亲核试剂加成到所得亚胺离子也具有高非对映选择性。碳亲核试剂加成导致前所未有的取代水平,以提供具有相邻四取代碳原子的哌啶环。
Highly Diastereoselective Synthesis of Tetrahydropyridines by a C–H Activation–Cyclization–Reduction Cascade
作者:Simon Duttwyler、Colin Lu、Arnold L. Rheingold、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja2119833
日期:2012.3.7
A versatile reaction cascade leading to highly substituted 1,2,3,6-tetrahydropyridines has been developed. It comprises rhodium(I)-catalyzed C-H activation-alkyne coupling followed by electrocyclization and subsequent acid/borohydride-promoted reduction. This one-pot procedure affords the target compounds in up to 95% yield with >95% diastereomeric purity.
Proton Donor Acidity Controls Selectivity in Nonaromatic Nitrogen Heterocycle Synthesis
作者:Simon Duttwyler、Shuming Chen、Michael K. Takase、Kenneth B. Wiberg、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1126/science.1230704
日期:2013.2.8
intermediate to a diverse array of compounds sought in pharmaceutical research. Piperidines are prevalent in natural products and pharmaceutical agents and are important synthetic targets for drug discovery and development. We report on a methodology that provides highly substituted piperidine derivatives with regiochemistry selectivelytunable by varying the strength of acid used in the reaction. Readily available
Synthesis of Dihydropyridines and Pyridines from Imines and Alkynes via C−H Activation
作者:Denise A. Colby、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja7104784
日期:2008.3.1
A convenient one-pot C-H alkenylation/electrocyclization/aromatization sequence has been developed for the synthesis of highly substituted pyridine derivatives from alkynes and alpha,beta-unsaturated N-benzyl aldimines and ketimines that proceeds through dihydropyridine intermediates. A new class of ligands for C-H activation was developed, providing broader scope for the alkenylation step than could be achieved with previously reported ligands. Substantial information was obtained about the mechanism of the reaction. This included the isolation of a C-H activated complex and its structure determination by X-ray analysis; in addition, kinetic simulations using the Copasi software were employed to determine rate constants for this transformation, implicating facile C-H oxidative addition and slow reductive elimination steps.