AbstractA palladium(0)‐catalyzed reaction of 2‐allyl‐3‐indolyl boronates/propargylic carbonates was observed to afford dihydrocycloocta[b]indoles highly efficiently via carbon‐carbon coupling, [1,5]‐hydrogen migration involving dearomatization, and electrocyclization involving rearomatization. Their thermal reactions with the addition of dienophiles involving eletrocyclization and [4+2] cycloaddition have been studied.magnified image
iodine-magnesium exchange. In many cases, the exchange can be extended to heteroaryl bromides, and a case of a chlorine-magnesium exchange is described with tetrachlorothiophene. This new preparation of functionalized heteroarylmagnesium compounds provides after reaction with various electrophiles a new entry to a broad range of polyfunctional pyridines, imidazoles, furanes, thiophenes, pyrroles, antipyrines
Efficient Carbazole Synthesis via Pd/Cu-Cocatalyzed Cross-Coupling/Isomerization of 2-Allyl-3-iodoindoles and Terminal Alkynes
作者:Can Zhu、Shengming Ma
DOI:10.1021/ol500119r
日期:2014.3.21
The Pd/Cu-cocatalyzed one-pot reaction of 2-allyl-3-iodo-1-tosyl-1H-indoles and terminal alkynes afforded carbazoles highly efficiently via sequential carbon carbon coupling, isomerization, cyclization, and aromatization forming a benzene ring. Both Pd and Cu are responsible for the coupling step, while K2CO3 was observed to be critical for the subsequent cyclization.