Short Syntheses of some ‘Decalin‐1,8‐diones’ and their Derivatives: Breaking the Pretended Symmetry
作者:Rudolf Knorr、Annette Nadolny、Hermann Hauer、Petra Böhrer
DOI:10.1002/hlca.201800231
日期:2019.6
2)oxazaphosphinin‐2‐one derivatives. The two regioisomers of a trimethyl‐3‐oxoenamine served as models for the constitutional assignments of the two rapidly interconverting (hence, individually NMR‐invisible), tautomeric trimethyl‐3‐oxoenols. Such methyl substitutions served to break the ‘pretended’ symmetry of ‘decalin‐1,8‐dione’. Hydrazine and 3‐oxoenols furnished oxygen‐free indazole derivatives whose N−H bonds
廉价的合成所谓的“十氢化萘-1,8-二酮”的方法是将环己二-2-烯-1-酮衍生物共轭(1,4-)加到二锂衍生物的γ-位上巴豆酸的-1,3-二烯-1,1-双(油酸酯)。这些'1,4- γ '加合物的氢化和最终环化提供了十氢化萘-1,8-二酮的烯醇互变异构体。这些3-氧代烯醇被NH 3或伯胺的亲核取代仅产生单胺产物(即3-氧代烯胺),其与OPCl 3反应生成二氢(1,3,2)草氮膦2-1-酮衍生物。三甲基-3-氧代烯胺的两个区域异构体是两个快速互变(因此,个别是NMR不可见的)互变异构三甲基-3-氧代烯醇的结构分配模型。这种甲基取代的作用是破坏“十氢化萘-1,8-二酮”的“假装”对称性。肼和3-氧烯醇提供了无氧吲唑衍生物,它们的NH键与t 1/2 = ca交换。0.00035 s的CA。−58(9)°C。