Three-Component One-Pot Approach to Synthesize Benzopyrano[4,3-d]pyrimidines
摘要:
A novel benzopyrano[4,3-d]pyrimidine scaffold was generated via a three-component one-pot reaction from iodochromone, alkyne, and an amidine through a Sonogashira coupling, condensation, and cycloaddition. This combinatorial synthetic approach provides an efficient, easy construction of a diversified heterocyclic compounds library.
palladium‐catalyzed [2+2+1] annulation among 3‐iodochromones, benzyl bromides, and norbornene has been developed. This annulation consists of a domino sequence involving Heck coupling/C(sp2)−Hactivation/C(sp3)−Hactivation, affording a variety of complex chromone derivatives bearing five contiguous tertiary carbon centers in up to 94% yield and 99:1 dr. Interestingly, the diastereoselectivity could be
Synthesis of 3-halochromones with simple KX halogen sources enabled by <i>in situ</i> halide oxidation
作者:Yan Lin、Jie-Ping Wan、Yunyun Liu
DOI:10.1039/d0nj00825g
日期:——
On the basis of a designated in situ oxidation tactic, the synthesis of 3-halochromones has been realized for the first time by using simple KX (X = Br, I) salts as halogen sources. Instead of the free radical process, the control experiments indicate that the reported reactions proceed through a halogenium intermediate. Compared to the known synthetic methods relying on molecular halogen, haloid acid
Three-Component One-Pot Approach to Synthesize Benzopyrano[4,3-<i>d</i>]pyrimidines
作者:Dewen Li、Shudong Duan、Youhong Hu
DOI:10.1021/cc100173b
日期:2010.11.8
A novel benzopyrano[4,3-d]pyrimidine scaffold was generated via a three-component one-pot reaction from iodochromone, alkyne, and an amidine through a Sonogashira coupling, condensation, and cycloaddition. This combinatorial synthetic approach provides an efficient, easy construction of a diversified heterocyclic compounds library.