A new single-step proline-potassium acetate promoted reductive dehydroxylation of α-ketols is reported. We introduce the unexplored reactivity of proline and, for the first time, reveal its ability to function as a reducing agent. The developed metal-free and open-flask operation generally results in good yields. Our protocol allows the challenging selective dehydroxylation of hydroxyketones without
5,10-Diacylcalix[4]pyrroles: synthesis and anion binding studies
作者:Sanjeev P. Mahanta、Pradeepta K. Panda
DOI:10.1039/c3ob41966e
日期:——
5,10-Diacylcalix[4]pyrrole, a new positional isomer of the recently reported 5,15-diacylcalix[4]pyrrole, is synthesized as its two configurational isomers by acid catalysed condensation of meso-diacyltripyrrane with pyrrole. The solution phase anion binding of the two isomers of 5,10-diacylcalix[4]pyrrole was investigated by 1H NMR spectroscopy in chloroform-d and isothermal titration calorimetry (ITC) in acetonitrile to gain insights into the positional and conformational effects of substituents on the macrocycle periphery towards anion binding. During the investigation, a functionalized, stable pyrrole-2-carbinol was isolated and subsequently converted to the corresponding tripyrrane in situ.