35524-51-7Relevant academic research and scientific papers
Electron-rich heteroaroylphosphonates and their reaction with trimethyl phosphite
Griffiths, D. Vaughan,Al-Jeboori, Mohamad J.,Cheong, Yuen-Ki,Duncanson, Philip,Harris, Jayne E.,Salt, Michael C.,Taylor, Helen V.
supporting information; experimental part, p. 577 - 585 (2008/10/09)
Dialkyl heteroaroylphosphonates based on thiophene, pyrrole or furan have been prepared and their reactions with trimethyl phosphite investigated. Deoxygenation of the carbonyl groups in these heteroaroylphosphonates occurs to give carbene intermediates, which then undergo further reaction. In the case of the furan-3-oylphosphonates and those systems containing a thiophene or pyrrole ring, the major reaction pathway involves intermolecular trapping of the carbene intermediates by the trimethyl phosphite, leading to the formation of ylidic phosphonates that can be readily converted into the corresponding 1,1-bisphosphonates. However, in some furan-2-oylphosphonates the carbenes generated undergo ring-opening to initially give acyclic alkynylphosphonates which may react further to give other novel phosphorus compounds. The effects of substituents on the extent to which intermolecular trapping of the initially formed carbene competes with intramolecular rearrangement has been investigated. The latter process appears to be suppressed by a substituent at the 5-position of the furan ring, the resulting ylidic phosphonates being a rare example of an efficient intermolecular trapping of a furan-2-yl carbene. The Royal Society of Chemistry 2008.
Ortho-METALLATION REACTIONS OF VARIOUS N-SUBSTITUTED PYRROLES
Cartoon, M. E. K.,Cheeseman, G. W. H.
, p. 123 - 136 (2007/10/02)
Two routes for the preparation of 2,3-disubstituted pyrroles have been explored.The first involves the directed palladation of a 2-dimethylaminomethylpyrrole and the second the lithiation of a 2-oxazolinopyrrole.
