Regiochemistry of the microwave-assisted reaction between aromatic amines and α-bromoketones to yield substituted 1H-indoles
作者:Yosu Vara、Eneko Aldaba、Ana Arrieta、José L. Pizarro、María I. Arriortua、Fernando P. Cossío
DOI:10.1039/b719641e
日期:——
Bischler (or Bischler-Mohlau) reaction between aromaticamines and alpha-bromoketones has been studied by computational and experimental techniques. It has been found that in many cases the reaction yields are improved under microwave irradiation and working in the absence of solvent. When di- and trisubstituted amines are used as substrates the regioselectivity of the reaction is different to that obtained
Indole synthesis: palladium-catalyzed C–H bond amination via reduction of nitroalkenes with carbon monoxide
作者:Tom H.H. Hsieh、Vy M. Dong
DOI:10.1016/j.tet.2008.11.034
日期:2009.4
nitroalkenes into indoles. Under mild reaction conditions (1 atm carbonmonoxide, 110 °C), palladium catalyzes the reductivecyclization of nitroalkenes to form a putative nitrosoalkene intermediate, which then rearranges to provide 3-arylindoles in high yields. Notably, this novel C–H bond amination takes advantage of carbonmonoxide as an inexpensive stoichiometric reductant and produces carbon dioxide as
Synthesis of<i>N</i>-Heterocycles by Reductive Cyclization of Nitroalkenes Using Molybdenum Hexacarbonyl as Carbon Monoxide Surrogate
作者:Zhiyou Su、Bo Liu、Hongze Liao、Hou-Wen Lin
DOI:10.1002/ejoc.202000580
日期:2020.7.15
The development of a method that uses molybdenumhexacarbonyl [Mo(CO)6] as carbon monoxide (CO) surrogate for the palladium‐catalyzed reductive cyclization of nitroalkenes into indoles or thienopyrroles is reported. Several types of nitroalkenes could be transformed into the desired products in excellent yields and in most cases with complete regioselectivities and higher yields than those previously