Synthesis of spiro[cycloalkane-1,3′-[3<i>H</i>]indoles] from cycloalkanecarbaldehydes. Acid-catalyzed rearrangement to cycloalkano[<i>b</i>]indoles
作者:J. G. Rodríguez、Y. Benito、F. Temprano
DOI:10.1002/jhet.5570220512
日期:1985.9
Spiro[cycloalkane-1,3′-[3H]indoles] 2 can be obtained from the cycloalkanecarbaldehydes 1 by the Fischer reaction of their phenylhydrazones. These cyclizations are sensitive to the acid catalyst, solvent and temperature employed. Rearrangement of the 2 to the homologous cycloalkane derivatives 3 can occur by an acid catalyst or by thermal treatment of 2 in ethyleneglycol.
螺[环烷-1,3'-[3 H ]吲哚] 2可以通过环hydr苯甲醛的苯hydr的费希尔反应从环烷甲醛1中获得。这些环化对所用的酸催化剂,溶剂和温度敏感。通过酸催化剂或通过在乙二醇中热处理2,可以将2重新排列为同源的环烷烃衍生物3。