Diastereoselective nucleophilic addition of acetylide to N-benzyl-2, nitrone (BIGN). Stereodivergent synthesis of β-hydroxy-α-(hydroxyamino)- and β-hydroxy-α-amino acids
摘要:
The stereocontrolled nucleophilic addition of lithium trimethylsilyl acetylide to the N-benzyl nitrone (BIGN) derived from 2,3-O-isopropylidene-D-glyceraldehyde, followed by oxidative cleavage of the ensuing propargyl hydroxylamines resulted in an efficient stereodivergent synthesis of fully protected epimeric N-hydroxy alpha-amino esters 8 and 13 as well as the corresponding cw-amino esters 9 and 14. (C) 1997 Published by Elsevier Science Ltd.
Diastereoselective nucleophilic addition of acetylide to N-benzyl-2, nitrone (BIGN). Stereodivergent synthesis of β-hydroxy-α-(hydroxyamino)- and β-hydroxy-α-amino acids
摘要:
The stereocontrolled nucleophilic addition of lithium trimethylsilyl acetylide to the N-benzyl nitrone (BIGN) derived from 2,3-O-isopropylidene-D-glyceraldehyde, followed by oxidative cleavage of the ensuing propargyl hydroxylamines resulted in an efficient stereodivergent synthesis of fully protected epimeric N-hydroxy alpha-amino esters 8 and 13 as well as the corresponding cw-amino esters 9 and 14. (C) 1997 Published by Elsevier Science Ltd.
A General Method for the Vinylation of Nitrones. Synthesis of Allyl Hydroxylamines and Allyl Amines
作者:Pedro Merino、Sonia Anoro、Santiago Franco、Jose M. Gascon、Victor Martin、Francisco L. Merchan、Julia Revuelta、Tomas Tejero、Victoria Tuñon
DOI:10.1080/00397910008087449
日期:2000.8
An examination of the vinylation of several nitrones is presented. Whereas a complete diastereofacial discrimination was observed upon the addition of vinyl organometallic reagents to alpha-alkoxy nitrones, the same reaction with alpha-amino nitrones pave syn adducts in all cases, with the only exception of a L-serine-derived alpha-amino monoprotected nitrone. The obtained allyl hydroxylamines were easily transformed into synthetically valuable allyl amines.