Preparation of Alkyl-Substituted Indoles in the Benzene Portion. Part 8. Improved Practical Synthesis of 4,4-Dialkoxy-1-(1-arylsulfonyl-3-pyrolyl)-1-butanone and 4-(1-Arylsulfonyl-3-pyrrolyl)-4-oxobutanal, and a Novel Synthetic Procedure for 4-Alkoxyindole Derivatives.
Preparation of Alkyl-Substituted Indoles in the Benzene Portion. Part 8. Improved Practical Synthesis of 4,4-Dialkoxy-1-(1-arylsulfonyl-3-pyrolyl)-1-butanone and 4-(1-Arylsulfonyl-3-pyrrolyl)-4-oxobutanal, and a Novel Synthetic Procedure for 4-Alkoxyindole Derivatives.
Preparation of Alkyl-Substituted Indoles in the Benzene Portion. Part 8. Improved Practical Synthesis of 4,4-Dialkoxy-1-(1-arylsulfonyl-3-pyrolyl)-1-butanone and 4-(1-Arylsulfonyl-3-pyrrolyl)-4-oxobutanal, and a Novel Synthetic Procedure for 4-Alkoxyindole Derivatives.
Important precursors (1 and 2) for the synthesis of 4-substituted indole derivatives were readily obtained by acid treatment of a tosylamide (13), which was prepared in a single operation by treatment of 10 with N-tosyl-N', N'-dimethylformamidine (TsN=CHNMe2). Compound (10) was effectively synthesezed from nitromethane and acrolein by way of a nitro compound (15). A novel indole formation reaction from the tosyl-amide (13) to gain short access to 4-alkoxyindoles, such as 16, 17, 19, and 21 is presented.