Efficient Synthesis of Highly Substituted Indolizinones via Iodocyclization and 1,2-Shift
作者:Ikyon Kim、Jihyun Choi、Ge Hyeong Lee
DOI:10.1055/s-2008-1072721
日期:2008.5
The 5-endo-dig iodocyclization of propargylic alcohols followed by a 1,2-shift provided rapid access to 2-iodoindolizinones, while the 5-endo-trig iodocyclization of allylic alcohols and subsequent dehydroiodination and 1,2-shift led to indolizinones. A number of highly substituted indolizinones were constructed under these mild reaction conditions.
A Highly Efficient Catalyst-Free
Cycloisomerization Approach to Indolizinones
作者:Ikyon Kim、Jihyun Choi、Sunkyung Lee、Ge Lee
DOI:10.1055/s-2008-1078022
日期:——
A highly efficient catalyst-free synthetic route to indolizinones was established from readily available tertiary propargylic alcohols via a facile thermally induced cycloisomerization. In addition, this transformation was found to be further expedited by microwave irradiation.
Indolizinones as synthetic scaffolds: fundamental reactivity and the relay of stereochemical information
作者:Alison R. Hardin Narayan、Richmond Sarpong
DOI:10.1039/c1ob06423a
日期:——
Indolizinones are under-explored N-heterocycles that react with exquisite chemo- and stereoselectivity. An exploration of the fundamental reactivity of these azabicycles demonstrates the potential to relay stereochemical information from the ring-fusion to newly formed stereocenters on the bicyclic core. The indolizinone diene undergoes selective hydrogenation and readily participates in Diels–Alder cycloadditions as well as ene reactions. The vinylogous amide embedded in the five-membered ring is resistant to reaction when the diene is in place. However, removal of the diene allows for diastereoselective hydrogenation of, and 1,4-additions to, the vinylogous amide. These fundamental reactions with indolizinones have provided a structurally diverse array of products that hold promise in the context of natural product synthesis.