NNNifty targets: In a straightforward copper‐mediated synthesis of 1,4‐disubstituted and 1,4,5‐trisubstituted 1,2,3‐triazoles, readily available aniline and N‐tosylhydrazone substrates underwent cyclization through CN and NN bond formation (see scheme; Piv=pivaloyl, Ts=p‐toluenesulfonyl). This method enables the preparation of 1,2,3‐triazoles with high efficiency under mild conditions without the
Amine-Catalyzed [3+2] Huisgen Cycloaddition Strategy for the Efficient Assembly of Highly Substituted 1,2,3-Triazoles
作者:Lei Wang、Shiyong Peng、Lee Jin Tu Danence、Yaojun Gao、Jian Wang
DOI:10.1002/chem.201103393
日期:2012.5.7
has been utilized to fully promote the Huisgen [3+2] cycloaddition with a broad spectrum of carbonyl compounds and azides, thereby permitting the efficient assembly of a vast pool of highly substituted 1,2,3‐triazoles. In particular, the employment of commonly used and commercially available carbonyl compounds has resulted in the introduction of a diverse set of functional groups, such as alkyl, aryl
An Enolate-Mediated Organocatalytic Azide-Ketone [3+2]-Cycloaddition Reaction: Regioselective High-Yielding Synthesis of Fully Decorated 1,2,3-Triazoles
作者:Adluri B. Shashank、S. Karthik、R. Madhavachary、Dhevalapally B. Ramachary
DOI:10.1002/chem.201405501
日期:2014.12.15
An enolate‐mediated organocatalytic azide–ketone [3+2]‐cycloaddition (OrgAKC) reaction of a variety of enolizable arylacetones and deoxybenzoins with aryl azides was developed for the synthesis of fully decorated 1,4‐diaryl‐5‐methyl(alkyl)‐1,2,3‐triazoles in excellent yields with high regioselectivity at 25 °C for 0.5–6 h. This reaction has an excellent outcome with reference to reaction rate, yield
Organocatalytic Synthesis of 1,2,3-Triazoles from Unactivated Ketones and Arylazides
作者:Mokhtaria Belkheira、Douniazad El Abed、Jean-Marc Pons、Cyril Bressy
DOI:10.1002/chem.201102046
日期:2011.11.11
complementary method to Huisgen's metal‐catalyzed triazole synthesis is described using unactivatedketones and arylazides as the substrates and proline as an organocatalyst. Dramatic acceleration was observed for this reaction using microwave activation and high regio‐ and chemoselectivities were obtained for a wide range of ketones and arylazides (see scheme).