Rhodium-Catalyzed Conversion of Furans to Highly Functionalized Pyrroles
摘要:
The synthesis of highly functionalized pyrroles has been achieved by reaction of rhodium-stabilized imino-carbenes with furans. The reaction features an initial [3+2] annulation to form bicyclic hemiaminals, followed by ring opening to generate trisubstituted pyrroles.
The cycloaddition of N-sulfonyl and N-sulfamoyl azides with terminal alkynes generally produces amide derivatives via ketenimine intermediates. We herein delineate a Cu(I) catalyzed method using a prolinamide ligand that selectively generates N-sulfonyl and sulfamoyltriazoles in aqueous media by inhibiting the cleavage of the N1–N2 bond of 5-cuprated triazole intermediates. The present method is mild
N-磺酰基和N-氨磺酰基叠氮化物与末端炔烃的环加成通常通过烯酮亚胺中间体产生酰胺衍生物。我们在此描述了一种使用脯氨酰胺配体的Cu( I ) 催化方法,该方法通过抑制 5-铜三唑中间体的N 1 -N 2键的裂解,在水介质中选择性生成 N -磺酰基和氨磺酰三唑。本方法温和且耐空气、湿气和多种官能团,从而可以轻松获得各种三唑产品。
Rhodium catalyzed diastereoselective synthesis of 2,2,3,3-tetrasubstituted indolines from N-sulfonyl-1,2,3-triazoles and ortho-vinylanilines
An efficient diastereoselective rhodium catalyzedsynthesis of indolines possessing two contiguous tetrasubstituted carbon centers has been achieved with good to excellent yields using ortho-vinylanilines and iminocarbenes derived from N-sulfonyl-1,2,3-triazoles. The reaction affords excellent cis-diastereoselectivity through the initial formation of a N-ylide followed by intramolecular trapping with
Cascade Rh(<scp>ii</scp>) and Yb(<scp>iii</scp>) catalyzed synthesis of substituted naphthofurans <i>via</i> transannulation of <i>N</i>-sulfonyl-1,2,3-triazoles with β-naphthols
An efficient cascade Rh(II) and Yb(III) catalyzed transannulation of N-sulfonyl-1,2,3-triazoles with β-naphthols has been accomplished for the synthesis of substituted naphthofurans in good yields. The reaction involves the initial rhodium catalyzed insertion of azavinyl carbene into the O–H bond followed by ytterbium catalyzed annulative C–C bond formation and concomitant aerial oxidation. The developed
derivatives has been accomplished from aniline-derived 1,3-aminoalcohols and N-sulfonyl-1,2,3-triazole. The developed reaction demonstrates the new reactivity of azavinyl carbenes and allows access to diverse substituted dihydro-3,1-benzoxazines in good yields. Importantly, the reaction was readily extended to diols and could be used for selective protection of amino alcohols with N-sulfonyl-1,2,3-triazole