A Versatile Cyclodehydration Reaction for the Synthesis of Isoquinoline and β-Carboline Derivatives
作者:Mohammad Movassaghi、Matthew D. Hill
DOI:10.1021/ol801264u
日期:2008.8.21
beta-carboline derivatives via mild electrophilic amide activation, with trifluoromethanesulfonic anhydride in the presence of 2-chloropyridine, is described. Low-temperature amide activation followed by cyclodehydration upon warming provides the desired products with short overall reaction times. The successful use of nonactivated and halogenated phenethylene derived amides, N-vinyl amides, and optically active
2,2′-Dipyridyl diselenide (PySeSePy) is the catalyst or activator of choice for the direct reaction of carboxylicacids with azides and trimethylphosphine at room temperature. The mechanism of the process, which is not an aza-Wittig reaction, has been elucidated.
A series of novel derivatives of artemisinin-4-(arylamino)quinazoline have been designed and synthesized, and most of them showing potent in vitro cytotoxic activityagainst HCT116 and WM-266-4 cell lines. Compound 32 was the most active derivative against HCT116 cell line with an IC50 of 110 nM, and significantly improved the antitumor activity of the parent compounds dihydroartemisinin (DHA) (IC50 = 2
oxidative cyclization/1,2-carbon migration of hydrazides for the synthesis of otherwise inaccessible hindered or enantiopure triazolopyridinones has been developed. This protocol exhibits broad substrate scope and can be easily scaled up by continuous flow synthesis under mild conditions. Most importantly, this method demonstrates a rearrangement with retention of configuration and can be readily applied
A study on the chiral inversion of mandelic acid in humans
作者:Maksims Yevglevskis、Catherine R. Bowskill、Chloe C. Y. Chan、Justin H.-J. Heng、Michael D. Threadgill、Timothy J. Woodman、Matthew D. Lloyd
DOI:10.1039/c3ob42515k
日期:——
R-2-hydroxy-2-phenylacetyl-CoA, a requirement for chiral inversion. Both S- and R-2-phenylpropanoyl-CoA were epimerised by AMACR, showing that it is the presence of the hydroxy group that prevents epimerisation of R- and S-2-hydroxy-2-phenylacetyl-CoAs. The results show that it is unlikely that 2-hydroxy-2-phenylacetyl-CoA is an intermediate in the chiral inversion of mandelic acid, and that the chiral inversion