Preparation of Aminoalkyl Chlorohydrin Hydrochlorides: Key Building Blocks for Hydroxyethylamine-Based HIV Protease Inhibitors
作者:Pierre L. Beaulieu、Dominik Wernic
DOI:10.1021/jo960109i
日期:1996.1.1
N-dibenzyl-alpha-amino aldehydes reacted with (chloromethyl)lithium, generated in situ from bromochloromethane and lithium metal, to give predominantly erythro aminoalkyl epoxides. Treatment of the crude epoxides with aqueous hydrochloric acid gave crystalline (2S,3S)-N,N-dibenzylamino chlorohydrin hydrochlorides in 32-56% overall yield and high isomeric purity. These compounds are versatile synthetic intermediates
Synthesis of chiral iodo-N,O-acetonide aminal scaffolds via an efficient cascade reaction of amino acid-derived epoxides
作者:J. Paige Souder、Zachary M. Evans、Joshua A. Driver、Eric J. Pozzo、Andrew J. Lampkins
DOI:10.1016/j.tetlet.2011.10.049
日期:2011.12
Novel aminoacid-derived iodo-N,O-acetonide aminals were developed as chiral, non-epimerizable scaffolds to facilitate complex molecule synthesis. These scaffolds are readily prepared from commercially available amino acid derivatives in ⩽6 steps, contain an orthogonally-protected β-hydroxy amine moiety, and feature a directly reactive alkyl-iodide group for facile substitution chemistry. Further,
Stereoselective Synthesis of<i>anti</i>-<i>N</i>-Protected 3-Amino-1,2-epoxides by Nucleophilic Addition to<i>N</i>-<i>tert</i>-Butanesulfinyl Imine of a Glyceraldehyde Synthon<sup>†</sup>
作者:Scott S. Harried、Michael D. Croghan、Matthew R. Kaller、Patricia Lopez、Wenge Zhong、Randall Hungate、Paul J. Reider
DOI:10.1021/jo900643b
日期:2009.8.21
A di-O-TBS protected glyceraldellyde synthon was condensed with Ellman's reagent to form a bench-stable N-tert-butanesulfinyl imine 6, which served as a common intermediate for the stereoselective introduction Of various R groups. The Ellman adducts were converted to useful Multifunctional intermediates 18a-i in one pot. The alcohols 18a-i were efficiently elaborated to both known and novel anti-N-protected-3-amino-1,2-epoxides in two steps. Compound 2a is a key intermediate toward HIV protease inhibitors.
Synthesis of New Enantiomerically Enriched β-Hydroxy-γ-amino Phosphines by Selective Transformation of Naturally Occurring Amino Acids
[GRAPHICS]Ring opening of amino epoxides derived from naturally occurring amino acids with lithium diphenylphosphido borane is reported as an efficient approach to a new family of enantiomerically enriched multifunctional phosphines.
Stereoselective Synthesis of Erythro α-Amino Epoxides