Selective 5-<i>exo-dig</i>Cyclization of<i>in Situ</i>Synthesized<i>N</i>-Boc-2-aminophenyl Ethoxyethynyl Carbenols: Synthesis of Multifunctional Indoles and Their Derivatives
作者:Nuligonda Thirupathi、Yalla Kiran Kumar、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1002/adsc.201301002
日期:2014.5.26
N‐Boc‐ortho‐aminoaryl ketones and ethoxyacetylene through a cascade of reactions in a single operation that included a nucleophile‐triggered 5‐exo‐dig cyclization and an acid‐mediated 1,3‐allyl alcohol isomerization (1,3‐AAI) is described. A variety of aryl, vinyl and alkynyl groups can be introduced at C‐3 of indole‐2‐carboxaldehyde while having a high functional group compatibility. The 3‐alkynyl adducts, which
一种通过一系列操作在单个操作中通过级联反应从N-邻-邻-氨基-芳基酮和乙氧基乙炔制备3-取代-2-甲酰基吲哚衍生物的方法,包括亲核试剂触发的5 -exo-dig环化反应和酸介导的1 ,3-烯丙基醇异构化(1,3-AAI)被描述。可以在吲哚-2-羧醛的C-3处引入各种芳基,乙烯基和炔基,同时具有很高的官能团相容性。3-炔基加合物是面向多样性合成的极有价值的底物,可通过新途径进一步转化为有用的咔啉和咔唑衍生物。