Stereoselective synthesis of β-amino alcohols: practical preparation of all four stereomers of N-PMB-protected sphingosine from l- and d-serine
摘要:
Serine was efficiently converted to the N-p-methoxybenzyl (PMB) protected alpha'-amino enone derivative 6, which was reduced with Zn(BH4)(2) to the corresponding anti-beta-amino alcohol in >96% de. On the other hand, N-PMB-N-Boc-protected alpha'-amino enone derivative 8 was reduced by NaBH4 to syn-product with a diastereoselectivity of ca. 90%. (C) 1999 Elsevier Science Ltd. All rights reserved.
Stereoselective synthesis of β-amino alcohols: practical preparation of all four stereomers of N-PMB-protected sphingosine from l- and d-serine
摘要:
Serine was efficiently converted to the N-p-methoxybenzyl (PMB) protected alpha'-amino enone derivative 6, which was reduced with Zn(BH4)(2) to the corresponding anti-beta-amino alcohol in >96% de. On the other hand, N-PMB-N-Boc-protected alpha'-amino enone derivative 8 was reduced by NaBH4 to syn-product with a diastereoselectivity of ca. 90%. (C) 1999 Elsevier Science Ltd. All rights reserved.
[EN] GUANIDINO-SUBSTITUTED QUINAZOLINONE COMPOUNDS AS MC4-R AGONISTS<br/>[FR] COMPOSES DE QUINAZOLINE SUBSTITUES PAR GUANIDINO CONSTITUANT DES AGONISTES DE MC4-R
申请人:CHIRON CORP
公开号:WO2004112793A1
公开(公告)日:2004-12-29
A variety of small molecule, guanidine-containing molecules capable of acting as MC4-R agonists are provided. The compounds are useful in treating MC4-R mediated diseases when administered to subjects. The compounds have the structure IA, IB, and IC where the values of the variables are defined herein.
A concise stereoselective synthesis of orthogonally protected lanthionine and β-methyllanthionine
作者:Steven L. Cobb、John C. Vederas
DOI:10.1039/b618178c
日期:——
ribosomally synthesized peptides contain either one or both of the unusual aminoacids meso-lanthionine (m-Lan) or beta-methyllanthionine (beta-MeLan). Nucleophilicringopening of sulfamidates allows facile preparation of stereochemically pure derivatives of m-Lan and beta-MeLan with orthogonal protection for solid phase synthesis of lantibiotic analogues.
A straightforward and efficient preparation of five-membered cyclicguanidines bearing an ester, a hydroxymethyl or a Weinreb amide functional group at C-4 is described from l -serine. The novel synthetic route provides cyclicguanidines in which the three nitrogen atoms are orthogonally protected making them highly suitable for further transformations into natural products or their analogues via the
[EN] QUINAZOLINONE COMPOUNDS WITH REDUCED BIOACCUMULATION<br/>[FR] COMPOSES DE QUINAZOLINONE AVEC BIOACCUMULATION REDUITE
申请人:CHIRON CORP
公开号:WO2005051391A1
公开(公告)日:2005-06-09
A variety of small molecule, guanidine-containing molecules capable of acting as MC4-R agonists are provided. The compounds are useful in treating MC4-R mediated diseases when administered to subjects. The compounds have the formula IA and IB. IA and IB have the following structures where Z has the formula shown below and the rest of the variables are defined herein.