The action of boiling acetic anhydride on β-ureidesters, β-N-carbonyl esters and β-amino-esters was studied. It was shown that no cyclization of β-ureidoesters occurred and that N,N-diacetyl and N-acetyl-β-aminoesters were the reaction products in all three cases. A satisfactory separation of these compounds by chromatography was achieved and their physical properties determined. The mechanism of the
Chiral oxazolidines obtained by condensation of aldehydes with (-).(R)- or (+).(S)-N-benzylphenylglycinol react with the Reformatsky reagent derived from ethylbromoacetate, in mild reaction conditions (Et2O or CH2Cl2, 0°C, 15-60 min), leading to ethyl β-amino carboxylates in moderate to good diastereomeric excess (60-92%). These ring opening products are transformed into primary β-aminoesters, in
Synthesis and biological activities of novel chiral fluorinated β-carboline derivatives
作者:Jin Chang Ding、Xiao Bo Huang、Hua Yue Wu、Jie Zhi Chen、Ming Tiao Cai、Miao Chang Liu
DOI:10.1002/jhet.5570450635
日期:2008.11
unreported chiral β-carbolines 4 with trifluoromethyl group at position-1 and chiral carboxamide chains or amino acid ester chains at position-3 has been designed and synthesized. The results of bioassay in vitro show that compounds 4e, 4i and 4k show 78.8%, 84.0% and 78.9% inhibition on monoamine oxidase, in 1 mmol/L, respectively, and compound 4e also exhibit 60.9% inhibitory activity on tumor lung