Domino reactions in water: diastereoselective synthesis of densely functionalized indolyldihydrofuran derivatives
作者:Pethaiah Gunasekaran、Kamaraj Balamurugan、Sathiyamoorthi Sivakumar、Subbu Perumal、J. Carlos Menéndez、Abdulrahman I. Almansour
DOI:10.1039/c2gc16517a
日期:——
A library of trans-5-aroyl-2-(indol-3-yl)-4-aryl-4,5-dihydrofuran-3-carbonitriles was diastereoselectively synthesized in excellent yields from the reaction of 2-(3-indolylcarbonyl)-3-aryl-2-propenenitriles with (2-aryl-2-oxoethyl)pyridinium bromides in the presence of triethylamine via a simple, user-friendly domino process carried out in water. Extraction and chromatographic steps were avoided, since the final products could be simply filtered from the aqueous reaction medium and recrystallized. This one-pot transformation generates one C–C and one C–O bond and presumably proceeds by a domino sequence involving the generation of a pyridinium ylide, a Michael addition and a final annulation via intramolecular nucleophilic substitution.
反式-5-芳酰基-2-(吲哚-3-基)-4-芳基-4,5-二氢呋喃-3-甲腈化合物库是由 2-(3-吲哚羰基)-3-芳基-2-丙烯腈与(2-芳基-2-氧代乙基)溴化吡啶鎓在三乙胺存在下通过一个简单、易操作的多米诺过程在水中非对映选择性合成的,产量极佳。由于只需从水性反应介质中过滤并重结晶最终产物,因此避免了萃取和色谱步骤。这种一锅转化生成了一个 C-C 键和一个 C-O 键,并可能通过多米诺顺序进行,包括生成吡啶鎓酰亚胺、迈克尔加成和通过分子内亲核取代最终环化。