Diversity Oriented Approach to Crownophanes by Enyne Metathesis and Diels–Alder Reaction as Key Steps
作者:Sambasivarao Kotha、Gopalkrushna T. Waghule
DOI:10.1021/jo300766f
日期:2012.7.20
Various crownophanes are assembled starting with simple phenol derivatives such as catechol, resorcinol, and hydroquinone. Here, cross-enyne metathesis (CEM) and Diels–Alder (DA) reaction have been used as keysteps. This strategy has embedded six diversity points.
The 1H and 13C NMR spectra of a series of structurally related crown ethers have been recorded, and the signals assigned by means of 1H/13C heteronuclear correlated and 1H/1H homonuclear NOE difference spectroscopy. The NMR parameters so extracted have been used to discuss the preferred, rapidly interconverting solution conformations of the studied species. The high‐field shifts in the 13C NMR spectra