METHOD OF PRODUCING BIPHENOLIC COMPOUND, NOVEL BIPHENYL COMPOUND AND SYNTHESIS METHOD THEREOF, AND PHARMACEUTICAL COMPOSITION FOR TREATING PARKINSON'S DISEASE
Selective formation of non-conjugated olefins by samarium(II)-mediated elimination/isomerization of allylic benzoates
作者:Sara L. Schaefer、Connor L. Roberts、Erasmus O. Volz、Monika R. Grasso、Gregory W. O’Neil
DOI:10.1016/j.tetlet.2013.08.136
日期:2013.11
Aromatic allylic benzoates can be selectively transformed to the corresponding benzoate eliminatedolefin by the action of samarium diiodide. Depending on the substrate and the elimination conditions, high selectivity for the non-conjugated alkene product can be achieved.
Synthetic scheme for the preparation of a number of different derivatives of anticancer naturalproduct Psoralidin is described. A convergent synthetic approach is followed using simple starting materials like substituted phenyl acetic esters and benzoic acids. The developed synthetic route leads us to complete the firstsynthesis of an analogous naturalproduct Lespeflorin I1, a mild melanin synthesis
acids mediated by hypervalentiodine(III) reagents is described. The decarboxylative C–O bond forming reaction proceeded in the presence of PhI(OAc)2 to give the corresponding allylic acetates. In addition, decarboxylative C–N bond formation was achieved by utilizing hypervalentiodine(III) reagents containing an I–N bond. Mechanistic studies suggest the unique reactivity of hypervalentiodine reagents
A simple synthesis of the natural product honokiol 1 has been developed which proceeds in four steps and provides a 32% overall yield. Suzuki coupling of 4-allyl-2-bromoanisole 3 with 4-hydroxyphenyl boronic acid, followed by allylation, gave 5-allyl-4′-allyloxy-2-methoxy-biphenyl 5. This compound 5 underwent Lewis acid-catalyzed Claisen rearrangement and demethylation in a one-pot reaction which yielded
Total synthesis of honokiol by selective samarium-mediated allylic benzoate reduction
作者:Alicia M. Wright、Gregory W. O’Neil
DOI:10.1016/j.tetlet.2016.06.066
日期:2016.8
The total synthesis of the biologicallyrelevant compound honokiol has been completed featuring a samarium-mediated bis-benzoyl ester reduction to simultaneously install both allyl substituents found in the natural product. This reaction was performed after a Suzuki coupling was used to generate the biphenyl core, thereby avoiding problems associated with the acidity of these allyl groups and their