A new natural cyclohexenone, 4-(p-methoxyphenethyl)-cyclohex-2-en-1-one, has been isolated from gametophytic tissues of the foliose liverwort Plagiochila longispina. The structure of this compound was elucidated by means of spectroscopic methods and by independent synthesis.
Sulfur-containing acylamino acids. II. Syntheses and angiotensin I converting enzyme-inhibitory activites of N-mercaptoalkanoyl-S-ethyl-L-cysteine.
作者:TAKETOSHI KOMORI、KATSUMI ASANO、YASUTO SASAKI、HIROMI HANAI、SHIRO MORIMOTO、MIKIO HORI
DOI:10.1248/cpb.35.2388
日期:——
N-Mercaptoalkanoyl derivatives of sulfur-containing amino acids were synthesized as candidate angiotensin I converting enzyme (ACE) inhibitors. Among them, N-[3-mercapto-2- (4-methoxybenzyl) propanoyl] -S-ethyl-L-cysteine (5d) was found to be the most potent inhibitor of ACE, with an IC50 value of 0.045μM. The maximum hypotensive effect of this compound was almost equal to that of captopril in anesthetized rats.
Preparation of α-bromoesters via the half esters of malonic acids a novel method for rapid decarboxylation under mild conditions
作者:O.P. Goel、U. Krolls
DOI:10.1016/s0040-4039(00)81355-6
日期:1983.1
α-Bromomalonic acid half esters were prepared in high yield and found to be rapidly decarboxylated to α-bromoesters under mild conditions using lithium carbonate in refluxing tetrahydrofuran.
Relative rates for the addition reactions of the malonyl radical to substituted styrenes induced by cerium(IV) ammonium nitrate and tributyltin hydride. A comparison