Facile Regioselective Synthesis of Functionalized Heterocycle-Tethered Spiro Compounds via an Intramolecular Electrophilic Ipso-Iodocyclization Process
作者:K. Majumdar、Tapas Ghosh、Pranab Shyam
DOI:10.1055/s-0031-1289526
日期:2011.11
A general, regioselective, and efficient intramolecular electrophilic ipso-iodocyclization of a series of N-alkyl-N-aryl phenylpropiolamides in the presence of I2 (molecular iodine) and NaHCO3 via 5-endo-dig mode of cyclization has been developed for the synthesis of hitherto unreported coumarin, quinolone, and pyrimidine-annelated heterocyclic compounds in excellent yields (84-92%). The development
已经开发了在I 2(分子碘)和NaHCO 3存在下,通过5-内切-环化环化的方法,对一系列N-烷基-N-芳基苯基丙丙酰胺进行一般,区域选择性和有效的亲电子碘环化反应,用于迄今未报道的香豆素,喹诺酮和嘧啶退火的杂环化合物的合成,收率极高(84-92%)。该方法学的发展提供了高效温和的反应条件,可轻松分离产物。合成的螺衍生物为进一步的功能化和合成新的生物活性杂环提供了诱人和有用的范围。 azaspiro杂环-亲电ipso-碘环化-香豆素-喹诺酮-尿嘧啶