The one-pot synthesis of multisubstituted pyrazole derivatives was achieved via catalyst-free 1,3-dipolar cycloaddition of ethyl diazoacetate and nitroalkenes as the key step and elimination of the leaving group (NO(2) or Br) followed by intramolecular proton transfer with satisfactory yields.
Chemical communications (Cambridge, England), (43)(43), 4477-4479 (2007-02-08)
Iron complexes of porphyrins (and corroles to a lesser extent) are the first catalysts to utilize ammonia for the synthesis of N-free amino acid esters.
The insertion reaction of diazocarbonyls to acids could be performed smoothly in fluorinated alcohols in the absence of metal catalyst. This new procedure allowed the chemoselective preparation of various functionalized compounds such as acyloxyesters, depsipeptides, and sulfonate, phosphonate, or boronate
Journal of the American Chemical Society, 130(41), 13526-13527 (2008-09-19)
A general and concise synthesis of functionalized indoles via domino reaction of N-aryl amides and ethyl diazoacetate has been developed. The methodology offers a great potential for the synthesis of biologically active and naturally occurring indole derivatives.
Chemical communications (Cambridge, England), (19)(19), 2045-2047 (2006-06-13)
A number of cationic gold(I) complexes have been synthesized and found to be stabilized by the use of N-heterocyclic carbene ligands. These species are often employed as in situ-generated reactive intermediates in gold catalyzed organic transformations. An isolated, well-defined species
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