Investigation of the selective reduction of isatin derivatives. Synthesis of α-hydroxyacetophenone derivatives and ethyl spiro-3,3-(ethylenedioxy)-2-hydroxyindoline carboxylates
作者:Simon J. Garden、Marilza B. Côrrea、Angelo C. Pinto
DOI:10.1016/j.tetlet.2003.08.058
日期:2003.10
The product from the reduction of ethyl spiro-3,3-(ethylenedioxy)-2-oxindole carboxylates (1) using borohydride salts has been found to be dependant upon both solvent and metal ion. With polar solvents and lithium bromide/sodium borohydride, spiro-3,3-(ethylenedioxy)-2-hydroxyindole carboxylates (2) are obtained in high yields whilst [2-(2-hydroxymethyl-[1,3]dioxolan-2-yl)-phenyl]-carbamic acid ethyl
已经发现使用硼氢化物盐还原乙基螺-3,3-(亚乙基二氧基)-2-氧吲哚羧酸盐(1)的产物既依赖于溶剂又依赖于金属离子。使用极性溶剂和溴化锂/硼氢化钠,可以高产率获得螺-3,3-(亚乙二氧基)-2-羟基吲哚羧酸酯(2),而[2-(2-羟甲基-[1,3]二氧戊环-2-)使用硼氢化钠在极性较小的溶剂中获得[ (yl)-苯基]-氨基甲酸乙酯(3)。