Intramolecular Cycloadditions of Photogenerated Azaxylylenes with Oxadiazoles Provide Direct Access to Versatile Polyheterocyclic Ketopiperazines Containing a Spiro-oxirane Moiety
作者:N. N. Bhuvan Kumar、Dmitry M. Kuznetsov、Andrei G. Kutateladze
DOI:10.1021/ol5033909
日期:2015.2.6
dinitrogen, yielding functionalized ketopiperazinoquinolinols containing an oxirane moiety fused to the quinolinole moiety while spiro-connected to diketopiperazine. These primary photoproducts are reactive versatile intermediates which can be further derivatized under nucleophilic SN1- or SN2-like ring opening of the oxirane moiety. The oxidized quinolinones undergo new rearrangements under the conditions
Development of a Large-Scale Route to an MCH<sub>1</sub> Receptor Antagonist: Investigation of a Staudinger Ketene–Imine Cycloaddition in Batch and Flow Mode
作者:Staffan Karlsson、Rolf Bergman、Christian Löfberg、Peter R. Moore、Fritiof Pontén、Joakim Tholander、Henrik Sörensen
DOI:10.1021/acs.oprd.5b00319
日期:2015.12.18
A practical large-scale route to an MCH, receptor antagonist is described. A Staudinger beta-lactam synthesis of an imine and an in situ generated ketene was utilized as a key step for the preparation of a spiro-azetidine building block. The reaction was demonstrated in both batch and flow mode and a comparison of these techniques is described.
DOST, J.;HESCHEL, M.;STEIN, J., J. PRAKT. CHEM., 1985, 327, N 1, 109-116
One-Pot Synthesis of Decahydropyrene via Tandem C–H Activation/Intramolecular Diels–Alder/1,3-Dipolar Cycloaddition
作者:Hui Lin、Lin Dong
DOI:10.1021/acs.orglett.6b02768
日期:2016.11.4
A novel decahydropyrene synthesis has been successfully developed involving a tandem rhodium-catalyzed C–H activation/intramolecular Diels–Alder reaction/1,3-dipolar cycloaddition cascade process by using diazole as a tracelessdirectinggroup. The advantage of this one-pot strategy is a quite simple, efficient, highly stereoselective, and unique product structure.