Proton magnetic resonance studies of compounds with bridgehead nitrogen atoms—XXVI
作者:T.A. Crabb、M.J. Hall、R.O. Williams
DOI:10.1016/s0040-4020(01)93494-5
日期:1973.1
3′-disubstituted, and 3,5-disubstitted perhydro-7a-methyloxazolo[3,4-c]oxazoles has been synthesised. Some indication of the predominant conformations of these systems and of the related perhydro-imidazo[1,5-c]thiazoles is obtainable from the magnitude of the geminal coupling constants of the methylene group protons situated between the heteroatoms.
已经合成了一系列的3-单取代的,3,3'-二取代的和3,5-二取代的全氢-7a-甲基恶唑并[3,4- c ]恶唑。这些体系和相关的全氢咪唑并[1,5- c ]噻唑的主要构型的某些迹象可从位于杂原子之间的亚甲基质子的双键偶合常数的大小获得。
A convenient method for optical resolutions via diastereoisomeric salt formation
作者:M. Ács、E. Fogassy、F. Faigl
DOI:10.1016/s0040-4020(01)96641-4
日期:1985.1
With the advantage of the method using two immiscrible solvents and half - equivalent amount of the resolving agent, higher optical purity can be obtained than in cases of any other resolution via diastereoisomeric salt formation, besides it is a faster procedure for resolution of a new racemate as well.
Ruthenium-Catalyzed Dehydrogenative Functionalization of Alcohols to Pyrroles: A Comparison between Metal–Ligand Cooperative and Non-cooperative Approaches
作者:Amit Kumar Guin、Rakesh Mondal、Gargi Chakraborty、Subhasree Pal、Nanda D. Paul
DOI:10.1021/acs.joc.2c00311
日期:2022.6.3
alcohols to further dehydrogenative functionalization of alcohols to various substituted pyrroles to understand the advantages/disadvantages of the metal–ligand cooperative approach. Various substituted pyrroles were prepared via dehydrogenative coupling of secondary alcohols and amino alcohols, and the N-substituted pyrroles were synthesized via dehydrogenative coupling of aromatic amines with cis-2-butene-1
在此,我们报告了两种钌基钳型催化剂 [ 1 ]X (X = Cl, PF 6 ) 和2 的合成和表征,其中包含两种不同的三齿钳型配体 2-吡唑基-(1,10-菲咯啉) ( L 1 ) 和 2-芳偶氮基-(1,10-菲咯啉) ( L 2a/2b , L 2a = 2-(苯基二氮烯基)-1,10-菲咯啉; L 2b = 2-((4-氯苯基)二氮烯基)-1,10-菲咯啉),以及它们在通过脱氢醇官能化反应合成取代吡咯中的应用。在催化剂 [ 1 ]X (X = Cl, PF 6),三齿支架 2-pyrazolyl-(1,10-phenanthroline) ( L 1 ) 显然是无氧化还原的,所有的氧化还原事件都发生在金属中心,配体仍然是旁观者。相反,在催化剂2a和2b,协调的偶氮芳族支架具有高度的氧化还原活性,并且已知在醇的脱氢过程中积极参与。对这两种催化剂的催化活性进行了比较,从醇的简单脱氢到醇