Divergent Pd-catalyzed Functionalization of 4-Oxazolin-2-ones and 4-Methylene-2-oxazolidinones and Synthesis of Heterocyclic-Fused Indoles
作者:Daniel Yescas-Galicia、Rodrigo A. Restrepo-Osorio、Ailyn N. García-González、Roberto I. Hernández-Benítez、José C. Espinoza-Hicks、Carlos H. Escalante、Edson Barrera、Blanca M. Santoyo、Francisco Delgado、Joaquín Tamariz
DOI:10.1021/acs.joc.2c01563
日期:2022.10.7
Palladium-catalyzed functionalization was presently performed on two building blocks: 4-oxazolin-2-ones and 4-methylene-2-oxazolidinones. Direct Heck arylation of 4-oxazolin-2-ones led to a series of 5-aryl-4-oxazolin-2-ones, including analogues with N-chiral auxiliary, in an almost quantitative yield. The Pd(II)-catalyzed homocoupling reaction of 4-oxazolin-2-ones provided novel heterocyclic across-ring
钯催化的功能化目前在两个结构单元上进行:4-恶唑啉-2-酮和 4-亚甲基-2-恶唑烷酮。4-oxazolin-2-ones 的直接 Heck 芳基化以几乎定量的产率产生一系列 5-aryl-4-oxazolin-2-ones,包括具有 N-手性助剂的类似物。Pd(II) 催化的 4-oxazolin-2-ones 的同源偶联反应提供了新的杂环跨环二烯。同时, N-芳基-4-亚甲基-2-恶唑烷酮的分子内交叉偶联提供了一系列恶唑并[3,4- a]吲哚-3-ones。4-亚甲基-2-恶唑烷酮的进一步官能化提供了取代的吲哚和杂环稠合的吲哚与芳基、溴、甲醇、甲酰基和乙烯基。进行了计算研究以解释甲酰化衍生物的行为。目前开发的方法应用于玫瑰树碱的一种新的正式全合成。