作者:John A. Murphy、Karen A. Scott、Rhona S. Sinclair、Norman Lewis
DOI:10.1016/s0040-4039(97)01695-x
日期:1997.10
Aryl radical cyclisation onto appropriate vinyl bromides leads to a new route to indoles.
芳基自由基环化到合适的乙烯基溴上,导致了通往吲哚的新途径。
A radical based addition–elimination route for the preparation of indoles
作者:John A. Murphy、Karen A. Scott、Rhona S. Sinclair、Concepcion Gonzalez Martin、Alan R. Kennedy、Norman Lewis
DOI:10.1039/b002565h
日期:——
Indoles, including tricyclic derivatives, are produced by cyclisations of aryl radicals onto vinyl halides followed by elimination of halide radical and tautomerism of the resulting product; the aryl radicals are produced using âclean methodologyâ either by reaction of iodide ions with arenediazonium salts or by reaction of phosphorus-centred radicals with aryl iodides.
A general and efficient synthesis of allenes using a palladium(0)/diethylzinc system is described. Treatment of mesylates or trichloroacetates of (E)- or (Z)-2-bromoalk-2-en-1-ols with diethylzinc in the presence of a catalytic amount of palladium(0) affords allenes bearing an aminoalkyl, alkyl, or aryl substituent(s) in good to high yields. No transfer of chirality from the stereogenic center carrying