and 1-naphthol-based carbamates undergo the anionic ortho-Fries rearrangement to their corresponding amides. Bulky substitution at position 8 of 1-naphthol-based carbamates makes the rearrangement an exclusive reaction, even at -90 °C, un- der a variety of conditions. The amides can be efficiently reduced to the corresponding Mannichbases. A novel route to 7-((dialkylami- no)methyl)-8-hydroxy-1-naphthaldehydes
苯酚和基于 1-萘酚的氨基甲酸酯经过阴离子邻位-弗里斯重排为其相应的酰胺。1-萘酚基氨基甲酸酯在 8 位的大量取代使重排成为一种独特的反应,即使在 -90 °C 下,在各种条件下也是如此。酰胺可以有效地还原为相应的曼尼希碱。提出了一种制备 7-((二烷基氨基) 甲基)-8-羟基-1-萘醛的新途径。
Switching azonaphthols containing a side chain with limited flexibility. Part 1. Synthesis and tautomeric properties
作者:Vanya B. Kurteva、Liudmil M. Antonov、Daniela V. Nedeltcheva、Aurélien Crochet、Katharina M. Fromm、Rositsa P. Nikolova、Boris L. Shivachev、Maya S. Nikiforova
DOI:10.1016/j.dyepig.2011.07.013
日期:2012.3
conversion to amides and diazo coupling. It was shown that the position of the tautomeric equilibrium in solution strongly depends on the solvent in both UV and NMR concentration scale. The compounds exist as pure enol forms in chloroform and hydrocarbons, while in polar solvents (acetone, acetonitrile, alcohols) a tautomeric mixture is observed. According to the quantum-chemical calculations the aggregation