Synthesis of 1,4-Diazacycles by Hydrogen Borrowing
作者:Anju Nalikezhathu、Adriane Tam、Valeriy Cherepakhin、Van K. Do、Travis J. Williams
DOI:10.1021/acs.orglett.3c00468
日期:2023.3.17
4-diazacycles by diol–diamine coupling, uniquely made possible with a (pyridyl)phosphine-ligated ruthenium(II) catalyst (1). The reactions can exploit either two sequential N-alkylations or an intermediate tautomerization pathway to yield piperazines and diazepanes; diazepanes are generally inaccessible by catalyticroutes. Our conditions tolerate different amines and alcohols that are relevant to key
Reaktionen Von Acetylencarbonsäureestern Mit Piperazinderivaten
作者:Hans Möhrle、Katja Azodi
DOI:10.1515/znb-2006-0815
日期:2006.8.1
benzylpiperazine (5) in 50% ethanol with addition of diethyl acetylenedicarboxylate (2) to a minor extent gives rise to (piperazine-1,4-diyl)-bis(maleate) (9), which is inert to Hg(II)-EDTA and results in quantitative yield when Hg(II)-EDTA is omitted. 4- Benzylpiperazin-1-yl)-monomaleate (8) reacts with 2 in various solvents by addition of water with dealkylation and formation of 9. CH-acidic compounds may