Ester-Imine Condensation Mediated by Potassium<i>tert</i>-Butoxide: Synthesis of β-Lactams and 3,4-Dihydropyridin-2-ones
作者:Gianfranco Cainelli、Mauro Panunzio、Daria Giacomini、Bruno Di Simone、Roberto Camerini
DOI:10.1055/s-1994-25579
日期:——
The utility of the weak base potassium tert-butoxide has been successfully demonstrated in the synthesis of ß-lactams and 3, 4-dihydropyridin-2-ones starting from esters and imines.
Baker's Yeast-Mediated Reductions of α-Keto Esters and an α-Keto-β-Lactam. Two Routes to the Paclitaxel Side Chain
作者:Margaret M. Kayser、Marko D. Mihovilovic、Jeff Kearns、Anton Feicht、Jon D. Stewart
DOI:10.1021/jo9900681
日期:1999.9.1
the case of ethyl benzoylformate, the addition of methyl vinyl ketone increased the enantioselectivity of the reduction. These reductions were applied to two syntheses of the paclitaxel C(13) side chain [(2R,3S)-N-benzoyl-3-phenylisoserine]. In the first, a racemic alpha-keto-beta-azido ester was reduced by whole cells of Baker's yeast to afford a diastereomeric mixture in which the desired product