Redox-Neutral Access to Sultams from 2-Nitrochalcones and Sulfur with Complete Atom Economy
作者:Thanh Binh Nguyen、Pascal Retailleau
DOI:10.1021/acs.orglett.7b01766
日期:2017.7.21
A catalyst-free, redox-neutral, and completely atom-economical synthesis of sultams by simply heating 2-nitrochalcones with elemental sulfur in 3-picoline or N-methylmorpholine is described. The S–N, C–S, and S═O bonds of the sulfonamide are efficiently formed between the nitrogen atom of the 2-nitro group and the α-carbon of the chalcones and elemental sulfur with the migration of two oxygen atoms
DIPEA-Promoted Reaction of 2-Nitrochalcones with Elemental Sulfur: An Unusual Approach to 2-Benzoylbenzothiophenes
作者:Thanh Binh Nguyen、Pascal Retailleau
DOI:10.1021/acs.orglett.7b02321
日期:2017.9.15
DIPEA was found to be an excellent sulfur activator to promote the reaction of 2-nitrochalcones with elementalsulfur. A wide range of 2-benzoylbenzothiophenes was obtained as a result of a cascade of alkene C═C bond thiolation, aromatic sulfur-denitration.
Pd-Catalyzed Cross-Coupling of Aryl Carboxylic Acids with Propiophenones through a Combination of Decarboxylation and Dehydrogenation
作者:Jun Zhou、Ge Wu、Min Zhang、Xiaoming Jie、Weiping Su
DOI:10.1002/chem.201200829
日期:2012.6.25
A Heck of a reaction: With a PCy3‐supported Pd catalyst, arylcarboxylicacids cross‐couple to saturated propiophenonesthrough a combination of decarboxylation and dehydrogenation to give chalcones bearing a variety of functional groups in generally good yields (see scheme). Furthermore, a one‐pot procedure, involving this reaction and a subsequent selective hydrogenative cyclization process, has