作者:Maged K. G. Mekhael、Stefan Bienz、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200490216
日期:2004.9
followed by aqueous workup and chromatographic separation leads to mixtures of N-(1,3,3-trialkyl-2,3-dihydro-indol-2-yliden)acetamides 16 and oxindoles 17 (Scheme 6). Hydrolysis of 16 with aqueous HCl under reflux for 1–2 h gives oxindoles 17 in a good yield. Several oxindoles, spiro-oxindoles, and 5-substituted oxindoles were synthesized by means of the reactions mentioned above.
建立了一种新型的合成羟吲哚的通用方法,即“通过am中间体扩大叠氮基/羟吲哚环”:在THF溶液中,2 H-叠氮基-3-胺1与BF 3 OEt 2在-下反应- 78°以良好的产率得到1,3,3-三烷基-2-氨基-3 H-四氟硼酸吲哚14(方案5)。用NaOH水溶液(30%)在0°下处理14的水溶液,并用CH 2 Cl 2萃取,得到油状物质,其为1,3,3-三烷基-2-二氢吲哚-2-亚胺的水合物15或相应的氢氧化吲哚。这些产物在H 2 O / THF中回流后,以中等收率转化成相应的1,3,3-三烷基-2,3-二氢吲哚-2-酮17。14与Ac 2 O在吡啶中于约2的反应。在23℃下反应16小时,随后进行水后处理和色谱分离,得到N-(1,3,3-三烷基-2,3-二氢-吲哚-2-亚胺基)乙酰胺16和羟吲哚17的混合物(方案6)。在回流下用HCl水溶液将16水解1-2小时,得到oxindoles 17产