Diastereoselective Carboxyl Migrations of 3-Arylbenzofuranones
作者:Gorka Peris、Edwin Vedejs
DOI:10.1021/jo7021444
日期:2008.2.1
[GRAPHICS]Mixed benzofuranyl carbonates derived from chiral chloro-formates rearranged in the presence of nucleophilic catalysts to give C-carboxylated benzofurans with variable dr. The use of chiral nucleophilic catalysts gave modest improvement in dr, but better results were obtained by optimizing auxiliary and catalyst. Thus, 8k was obtained with 9:1 dr.
Synthesis of the Diazonamide A Macrocyclic Core via a Dieckmann-Type Cyclization
作者:Edwin Vedejs、Matthew A. Zajac
DOI:10.1021/ol016097r
日期:2001.8.9
[reaction: see text] Suzuki coupling of 18 and 30 affords 9 as an interconverting mixture of two atropisomers. Treatment with LDA at -23 degrees C affords the macrocyclic ketone 8 in 57% yield.