نتایج جستجو برای: stereochemistry
تعداد نتایج: 3446 فیلتر نتایج به سال:
The syntheses of all stereoisomers of tetrasubstituted tetrahydrofuran lignan were accomplished, and the antimicrobial activity was examined. The 9,9'-diol compound bearing (7R,7'R,8R,8'R) and (7R,7'S,8R,8'R) stereochemistry showed the strongest antibacterial activity against Listeria denitrificans and Bacillus subtilis, respectively. It was also found that (-)-virgatusin bearing (7S,7'R,8S,8'S...
Allylboronic acids directly react with acyl hydrazones, affording homoallylic amine derivatives. The reaction proceeds with very high syn selectivity, which is the opposite of the stereochemistry observed for allylboration of imines. The reaction can be carried out with both aromatic and aliphatic acyl hydrazones. Based on our studies the excellent syn stereochemistry can be explained by chelat...
Two synthetic strategies for the generation of delta-substituted pyranoid sugar amino acids (SAAs) are evaluated. The first employs chiral nonracemic tert-butane sulfinamides as key reagents. Regardless of the stereochemistry of the applied sulfinamide, the product formed has a stereochemistry resembling that of a d amino acid at C7. Direct Grignard reaction on formyl-tetra-O-benzyl-beta-D-C-gl...
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