Synthesis of 5-alkylidene-2,5-dihydropyrrol-2-ones and their ring-transformation into 5,6-dihydrobenzo[h]chromones, 5,6,7,8-tetrahydrochromones and pyran-4-ones
作者:Van T.H. Nguyen、Joachim T. Anders、Qingjun Ma、Regine Herbst-Irmer、Peter Langer
DOI:10.1016/j.tet.2007.10.035
日期:2007.12
Acid-mediated ring-transformations of 5-alkylidene-2,5-dihydropyrrol-2-ones, available by cyclization of 1,3-diketone dianions with bis(imidoyl) dichlorides of oxalic acid, resulted in formation of functionalized pyran-4-ones, such as 5,6-dihydrobenzo[h]chromones and 5,6,7,8-tetrahydrochromones.
5-亚烷基-2,5-二氢吡咯-2-酮的酸介导的环转化,可通过将草酸的双(亚氨基酰基)二氯化物与1,3-二酮二价阴离子环化而得到,从而形成官能化的吡喃-4-诸如5,6-二氢苯并[ h ]色酮和5,6,7,8-四氢色酮。
The total synthesis of (± )-trichostatin A
作者:Ian Fleming、Javed Iqbal、Ernst-Peter Krebs
DOI:10.1016/s0040-4020(01)88581-1
日期:1983.1
Two successful synthetic routes to trichostatin A (1) are described; one (Scheme 2) uses the γ-alkylation of a silyl dienol ether, the other (Scheme 4) uses a silyl-protected cyanohydrin anion. The two routes bear an upolung relation to each other. The Lewis acid-catalysed acylation of silyl enol ethers is a simple and effective way to prepare β-diketones and β-keto esters (Scheme 1); this reaction
A series of 1-methyl-7-(4-pyridyl)-5,6,7,8-tetrahydro-3(2H)-isoquinolinones and relatedcompounds were synthesized and evaluated for positive inotropic activity. Most members of this series exerted a dose-dependent increase in myocardial contractility in the dog acute heart failure model, whereas they caused only slight changes in heart rate and blood pressure. Several derivatives, especially those