A Reinvestigation of 4-Hydroxyindole-6-carboxylate Synthesis from Pyrrole-2-carboxaldehyde: A Facile Synthesis of Indoles and Indolizines
摘要:
Cyclization of the Stobbe product 3 under the literature conditions (acetic anhydride/sodium acetate) affords both the indole 6 and the indolizine 8. The presence of base promotes the formation of indolizine products, and using acetic anhydride/triethylamine leads to indolizine products in good yield. Improved conditions for conversion to indoles 2, 5, and 6 are reported, and inconsistencies in some of the literature structure assignments and characterization data are noted.
A Reinvestigation of 4-Hydroxyindole-6-carboxylate Synthesis from Pyrrole-2-carboxaldehyde: A Facile Synthesis of Indoles and Indolizines
摘要:
Cyclization of the Stobbe product 3 under the literature conditions (acetic anhydride/sodium acetate) affords both the indole 6 and the indolizine 8. The presence of base promotes the formation of indolizine products, and using acetic anhydride/triethylamine leads to indolizine products in good yield. Improved conditions for conversion to indoles 2, 5, and 6 are reported, and inconsistencies in some of the literature structure assignments and characterization data are noted.
A Reinvestigation of 4-Hydroxyindole-6-carboxylate Synthesis from Pyrrole-2-carboxaldehyde: A Facile Synthesis of Indoles and Indolizines
作者:Musong Kim、Edwin Vedejs
DOI:10.1021/jo040191e
日期:2004.10.1
Cyclization of the Stobbe product 3 under the literature conditions (acetic anhydride/sodium acetate) affords both the indole 6 and the indolizine 8. The presence of base promotes the formation of indolizine products, and using acetic anhydride/triethylamine leads to indolizine products in good yield. Improved conditions for conversion to indoles 2, 5, and 6 are reported, and inconsistencies in some of the literature structure assignments and characterization data are noted.