Highly Diastereoselective Synthetic Route to Enantiopure β<sup>2</sup>-Amino Acids and γ-Amino Alcohols Using a Fluorinated Oxazolidine (Fox) as Chiral Auxiliary
reactions of an amide enolate derived from a trifluoromethylated oxazolidine (Fox) chiral auxiliary occur with a complete diastereoselectivity and in good yields with various electrophiles. This reaction provides a versatile and straightforward strategy for the synthesis of β2-aminoacids and γ-amino alcohols in enantiopure form.
Direct Catalytic Enantioselective α-Aminomethylation of Aldehydes
作者:Ismail Ibrahem、Gui-Ling Zhao、Armando Córdova
DOI:10.1002/chem.200600725
日期:2007.1.2
The directcatalytic asymmetric alpha-aminomethylation of aldehydes is presented. The chiral amine and amino acid catalyzed reactions between unmodified aldehydes and a formaldehyde-derived imine precursor were fast and proceeded with high chemo- and enantioselectivities. The corresponding dibenzyl-protected gamma-amino alcohols were isolated in high yields with up to 98% ee after in situ reduction