One-pot synthesis of enantiomerically pure <i>N</i>-protected allylic amines from <i>N</i>-protected α-amino esters
作者:Gastón Silveira-Dorta、Sergio J Álvarez-Méndez、Víctor S Martín、José M Padrón
DOI:10.3762/bjoc.12.94
日期:——
An improved protocol for the synthesis of enantiomerically pure allylic amines is reported. N-Protected alpha-amino esters derived from natural amino acids were submitted to a one-pot tandem reduction-olefination process. The sequential reduction with DIBAL-H at -78 degrees C and subsequent in situ addition of organophosphorus reagents yielded the corresponding allylic amines without the need to isolate
Synthesis and identification of unprecedented selective inhibitors of CK1ε
作者:Gastón Silveira-Dorta、Inês J. Sousa、Miguel X. Fernandes、Victor S. Martín、José M. Padrón
DOI:10.1016/j.ejmech.2015.03.046
日期:2015.5
A small and structure-biased library of enantiopure anti-beta-amino alcohols was prepared in a straightforward manner by a simplified version of the Reetz protocol. Antiproliferative activity testing against a panel of five human solid tumor cell lines gave GI(50) values in the range 1-20 mu M. The reverse screening by computational methods against 58 proteins involved in cancer pointed to kinases as possible therapeutic target candidates. The experimental determination of the interaction with 456 kinases indicated that the compounds behave as selective CK1 epsilon inhibitors. Our results demonstrate that the lead compound represents the first selective CK1 epsilon inhibitor with proven antiproliferative activity in cancer cell lines. (C) 2015 Elsevier Masson SAS. All rights reserved.
Stereoselective Synthesis of Natural and Non-natural Thomsen-nouveau Antigens and Hydrazide Derivatives
作者:Ahmad Ali Shaik、Sharmeen Nishat、Peter R. Andreana
DOI:10.1021/acs.orglett.5b00512
日期:2015.6.5
A selective glycosylation strategy enabling access to all stereochemical combinations of tumor associated Thomsen-nouveau (Tn) antigen, d-GalNAc-O-Ser/Thr, has been developed. The key component for selectivity is the phthalimide-protected d- or l-amino acid acceptors which allow access to alpha- or beta-anomers in excellent yields (72-96%) and selectivity (similar to 100%) when appropriate C-2 substitution is installed. The glycoamino acid intermediates were divergently converted to Tn-based carboxylates or to hydrazides by tandem Pd-C debenzylation followed by treatment with hydrazine hydrate or hydrazine hydrate treatment alone.
A facile stereospecific synthesis of .alpha.-fluoro .beta.-amino acids
作者:Lila Somekh、Abraham Shanzer
DOI:10.1021/ja00385a070
日期:1982.10
Easy synthesis of a new C2-symmetric diaza-crown ether from L-threonine
作者:Jean-Pierre Joly、Gerhard Schröder
DOI:10.1016/s0040-4039(97)10254-4
日期:1997.11
The 1:1-cyclocondensation of a contrafunctional chiral amine easily obtained from L-threonine in four steps yielded the new C-2-symmetric diaza-crown ether 5. (C) 1997 Elsevier Science Ltd.