Intramolecular Inverse Electron-Demand [4 + 2] Cycloadditions of Ynamides with Pyrimidines: Scope and Density Functional Theory Insights
作者:Guillaume Duret、Robert Quinlan、Boyang Yin、Rainer E. Martin、Philippe Bisseret、Markus Neuburger、Vincent Gandon、Nicolas Blanchard
DOI:10.1021/acs.joc.6b02986
日期:2017.2.3
prepared in only three steps from commercially available pyrimidines. The key step of this short sequence is a [4 + 2]/retro-[4 + 2] cycloaddition between a pyrimidine and an ynamide, which constitutes the first examples of ynamides behaving as electron-rich dienophiles in [4 + 2] cycloaddition reactions. In addition, running the ihDA/rDA reaction in continuous mode in superheated toluene, to overcome
Synthesis of Annulated Pyridines by Intramolecular Inverse-Electron-Demand Hetero-Diels-Alder Reaction under Superheated Continuous Flow Conditions
作者:Rainer E. Martin、Falk Morawitz、Christoph Kuratli、André M. Alker、Alexander I. Alanine
DOI:10.1002/ejoc.201101538
日期:2012.1
materials was investigated and a scalable flow process was developed, providing facile access to a series of novel annulatedpyridine building blocks. The effect of thermal volume expansion of solvents undersuperheatedconditions was found to be significant and influenced the residence times considerably. To obtain meaningful and accurate residence times, flow rates need to be corrected for volume expansion