A Study on the Asymmetric Synthesis of β-Lactams through Double Stereodifferentiating Cycloaddition Reactions
作者:Claudio Palomo、Jesús M. Aizpurua、Antonia Mielgo、Anthony Linden
DOI:10.1021/jo9612180
日期:1996.1.1
The cycloaddition reaction of chiral aminoketenes, generated from their corresponding acid chlorides and triethylamine, with chiral imines is evaluated as the most direct approach for the construction of cis-beta-lactams with the absolute stereochemistry at the C-3 and C-4 positions being controlled by the ketene partner, independently of the absolute stereochemistry of the imine component.
A Configurationally Stable Alkoxy Allenyl Zinc Reagent, en Route to <i>a</i><i>nti</i>-<i>a</i><i>nti</i> Vicinal Amino Diols
作者:Jean-François Poisson、Jean F. Normant
DOI:10.1021/ol015941a
日期:2001.6.1
[GRAPHICS]The reaction of an alkoxyallenyl zinc reagent with benzyl imines derived from lactic and mandelic acids proceeds highly diastereoselectively and leads to 2-amino-1,3-diol derivatives with an anti-anti pattern.
Kinetic Resolution of an Organozinc Reagent: In Situ Formation of an Enantioenriched Allenylzinc Species