Rhodium-Catalyzed Intermolecular C–H Functionalization as a Key Step in the Synthesis of Complex Stereodefined β-Arylpyrrolidines
摘要:
The synthesis of beta-arylpyrrolidines via a catalytic enantioselective intermolecular allylic C(sp)(3)-H functionalization of trans-alkenes followed by immediate reduction, ozonolysis, and then in situ diversification of the resulting cyclic hemiaminal to furnish highly substituted, stereoenriched beta-arylpyrrolidines is reported. This methodology utilizes 4-aryl-1-sulfony1-1,2,3-triazoles as carbene precursors and the dirhodium tetracarboxylate catalyst Rh-2(S-NTTL)(4). A variety of beta-arylpyrrolidines were prepared in good yields with high levels of diastereo- and enantioselectivity over four linear steps, requiring only a single purification procedure.
Transannulation of 1-Sulfonyl-1,2,3-triazoles with Heterocumulenes
作者:Stepan Chuprakov、Sen Wai Kwok、Valery V. Fokin
DOI:10.1021/ja400350c
日期:2013.3.27
reactions with isocyanates and isothiocyanates, respectively. The proposed triazole-diazoimine equilibrium results in the formation of highly reactive azavinyl metal-carbenes, which react with heterocumulenes causing an apparent swap of 1,2,3-triazole core for another heterocycle.
<i>N</i>-Imidazolylation of Sulfoximines from<i>N</i>-Cyano Sulfoximines, 1-Alkynes, and<i>N</i>-Sulfonyl Azides
作者:Sanghyuck Kim、Ji Eun Kim、Jinsub Lee、Phil Ho Lee
DOI:10.1002/adsc.201500636
日期:2015.11.16
The rhodium-catalyzed N-imidazolylation of N-sulfonyl-1,2,3-triazoles with a variety of N-cyano sulfoximines has been developed for the synthesis of N-imidazolyl sulfoximines via elimination of molecular nitrogen. Copper-catalyzed [3+2] cycloaddition followed by rhodium-catalyzed N-imidazolylation from 1-alkynes, N-sulfonylazides, and N-cyano sulfoximines is also demonstrated for the synthesis of N-imidazolyl
Diastereoselective Synthesis of Tetrahydrofurano- and Tetrahydropyrano-dihydropyrroles Containing<i>N</i>,<i>O</i>-Acetal Moieties<i>via</i>Rhodium-Catalyzed Transannulation of<i>N</i>-Sulfonyl-1,2,3-triazoles with Oxacycloalkenes
作者:Cheol-Eui Kim、Youngchul Park、Sangjune Park、Phil Ho Lee
DOI:10.1002/adsc.201400604
日期:2015.1.12
Diastereoselective synthesis of tetrahydro‐furanodihydropyrroles and tetrahydropyranodihydropyrroles containing N,O‐acetal moieties is reported via rhodium‐catalyzed denitrogenative transannulation of N‐sulfonyl‐1,2,3‐triazoles with oxacycloalkenes. A multitude of functionalizedpyrroles possessing hydroxyalkyl group at C3‐position could be prepared via Rh‐catalyzed denitrogenative transannulation/acid‐catalyzed