Ring-transformations of pyrimidines by intramolecular diels-alder reactions. Synthesis of annelated fyridines
作者:A.E. Frissen、A.T.M. Marcelis、H.C. Van Der Plas
DOI:10.1016/0040-4020(89)80111-5
日期:1989.1
Pyrimidines carrying an ω-alkyne side-chain -XCH2CH2CCH (X=O,N,S,SO,SO2) at the 2 or 5 position undergo intramolecularinverseelectrondemandDiels-Alderreactions across the C-2 and C-5 positions; elimination of hydrogen (or alkyl) cyanide from the intermediate adducts leads to condensed pyridines. The influence of the hetero atom (X) in the dienophilic side-chain and that of substituents in the
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
Novel intramolecular Diels-Alder reactions of pyrimidines. Synthesis of heterocyclic annelated pyridines
作者:August E. Frissen、Antonius T.M. Marcelis、Henk C. van der Plas
DOI:10.1016/s0040-4039(01)81049-2
日期:1987.1
Pyrimidines carrying a dienophilic side-chain at the 2 or 5 position undergo intramolecularDiels-Alderreactions to give heterocyclic annelated pyridines.
Synthesis of 4-aza analog of ramelteon: a novel tricyclic 1,6,7,8-tetrahydro-2H-cyclopenta[d]furo[2,3-b]pyridine derivative as melatonin receptor ligand
The 4-aza analog of ramelteon (−)-1, a novel tricyclic 1,6,7,8-tetrahydro-2H-cyclopenta[d]furo[2,3-b]pyridine derivative, was synthesized via the intramolecularinverseelectrondemandDiels–Alderreaction followed by fluoride-induced desilylation–cyclization.
通过分子内逆合成Ramelteon(-)- 1的4-氮杂类似物,这是一种新型的三环1,6,7,8-四氢-2 H-环戊[ d ]呋喃[2,3- b ]吡啶衍生物。电子需求Diels–Alder反应,然后是氟化物诱导的去甲硅烷基化–环化反应。