Asymmetric Synthesis of New Chiral β-Amino Acid Derivatives by Mannich-type Reactions of Chiral <i>N</i>-Sulfinyl Imidates with <i>N</i>-Tosyl Aldimines
作者:Filip Colpaert、Sven Mangelinckx、Norbert De Kimpe
DOI:10.1021/ol100073y
日期:2010.5.7
New chiral β-(sulfonylamino)sulfinylimidates are synthesized in high overall yield and excellent diastereomeric excess via highly anti-selective Mannich-type reactions of chiral N-tert-butanesulfinyl imidates with N-tosyl aldimines. Deprotection of the β-(sulfonylamino)sulfinylimidates gave access to enantiopure imidate hydrochlorides in high yields, as useful intermediates for an easy transformation
Asymmetric Synthesis of Substituted Azetidine Type α- and β-Amino Acids
作者:Dieter Enders、Jörg Gries
DOI:10.1055/s-2005-918421
日期:——
A versatile asymmetricsynthesis of 3-substituted azetidine-2-carboxylic acids and 2-substituted azetidine-3-carboxylic acids via 1.3-amino alcohols with excellent stereoselectivities (de > 96%, ee > 96%) is reponed. The high asymmetric inductions were achieved employing the SAMP/RAMP-hydrazone methodology. A phenyl moiety was used as a synthetic equivalent of the carboxylic acid function. In addition