Titanium(IV) Isopropoxide as an Efficient Catalyst for Direct Amidation of Nonactivated Carboxylic Acids
作者:Hans Adolfsson、Helena Lundberg、Fredrik Tinnis
DOI:10.1055/s-0032-1316993
日期:——
Secondary and tertiary amides are formed in high yields, in an efficient and environmentally benign titanium(IV) isopropoxide catalyzed direct amidation of carboxylic acids with primary and secondary amines.
Direct Amide Coupling of Non-activated Carboxylic Acids and Amines Catalysed by Zirconium(IV) Chloride
作者:Helena Lundberg、Fredrik Tinnis、Hans Adolfsson
DOI:10.1002/chem.201104055
日期:2012.3.26
Amidst the green: A green, mild and effective protocol for the direct formation of secondary and tertiary amides from non‐activated carboxylicacids and amines in good to excellent yields by employing ZrCl4 as the catalyst is presented (see scheme). The amidecoupling protocol proved to be suitable for scaled up syntheses, and the mild reaction conditions conserve the enantiopurity of chiral starting