L-Thienylalanines were prepared via the hydantoin and azlactone routes with the key step consisting of the microbial transamination of 2-hydroxy-3-thienylacrylic with L-aspartic acid as amino donor. The transamination reaction was performed by a genetically engineered E. coli strain on scales up to 100 g of L-3-(2-thienyl)alanine 1a and is also applicable to the preparation of the isomeric amino acid 1b and some ring-substituted derivatives. (C) 1997 Elsevier Science Ltd.
Oxazolone-Based Photoswitches: Synthesis and Properties
作者:Marina Blanco-Lomas、Ignacio Funes-Ardoiz、Pedro J. Campos、Diego Sampedro
DOI:10.1002/ejoc.201300641
日期:2013.10
synthesis, photophysics and photochemistry of a family of molecular switches inspired by the green fluorescent protein (GFP) chromophore is presented. These compounds can be synthesized in one step and good yields, their photophysical properties may be tuned by the substituents, solvent and wavelength of irradiation, and they show very efficient and fast photoisomerization. Furthermore, their high thermal
The invention provides a method of treating or inhibiting the growth of or eradicating a tumor in a mammal in need thereof wherein said tumor is resistant to at least one chemotherapeutic agent which method comprises providing to said mammal an effective amount of a compound of Formula II or a pharmaceutically acceptable salt thereof.
(Z)-2-N-Acylamino-3-thienyl-acrylic acids and their esters were prepared by known procedures and hydrogenated to the corresponding optically active 2-N-acetyl(or benzoyl)-3-(2- or 3-thienyl)-alanines with optical yields up to 90 % using the rhodium complexes of ''PROPRAPHOS'' 6a,b and O,N-bis(diphenylphosphino)-2-exo-hydroxy,3-endo-methylamino-norbornane 6c as chiral catalysts, Recrystallization and deacylation of the obtained amino acid derivatives yields the optically pure hydrochlorides of the thienylalanines and the free amino acids.
Synthesis and activity of novel analogs of hemiasterlin as inhibitors of tubulin polymerization: modification of the A segment
作者:Ayako Yamashita、Emily B. Norton、Joshua A. Kaplan、Chuan Niu、Frank Loganzo、Richard Hernandez、Carl F. Beyer、Tami Annable、Sylvia Musto、Carolyn Discafani、Arie Zask、Semiramis Ayral-Kaloustian
DOI:10.1016/j.bmcl.2004.08.024
日期:2004.11
Analogs of hemiasterlin (1) and HTI-286 (2), which contain various aromatic rings in the A segment, were synthesized as potential inhibitors of tubulin polymerization. The structure-activity relationships related to stereo- and regio-chemical effects of substituents on the aromatic ring in the A segment were studied. Analogs, which carry a meta-substituted phenyl ring in the A segment show comparable activity for inhibition of tubulin polymerization to 2, as well as in the cell proliferation assay using KB cells containing P-glycoprotein, compared to those of 1 and 2. (C) 2004 Elsevier Ltd. All rights reserved.