Asymmetric Formal Carbonyl-Ene Reactions of Formaldehyde <i>tert</i>-Butyl Hydrazone with α-Keto Esters: Dual Activation by Bis-urea Catalysts
作者:Ana Crespo-Peña、David Monge、Eloísa Martín-Zamora、Eleuterio Álvarez、Rosario Fernández、José M. Lassaletta
DOI:10.1021/ja305209w
日期:2012.8.8
The dual activation of α-ketoesters and formaldehyde tert-butyl hydrazone by BINAM-derived bis-ureas is the key to achieve high reactivity and excellent enantioselectivities in nucleophilicaddition (formal carbonyl-ene reaction) to functionalized tertiary carbinols. Ensuing high-yielding diazene-to-aldehyde tranformations and subsequent derivatizations provides a direct entry to a variety of densely
Compounds of formula (I)
1
in which R
2
, X, Y, Cy, L and Lp(D)
n
have the meanings given in the specification, are inhibitors of the serine protease, Factor Xa and are useful in the treatment of cardiovascular disorders.
Compounds of formula (I) in which R
2
, X, Y, Cy, L and Lp(D)
n
have the meanings given in the specification, are inhibitors of the serine protease, Factor Xa and are useful in the treatment of cardiovascular disorders.
1