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Synthesis of 3-pyrrolin-2-ones

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A 3 + 2 cycloaddition of α-imino rhodium carbenoids generated from 1-sulfonyl 1,2,3-triazoles with ketene silyl acetals offers a novel and straightforward synthesis of biologically interesting 3-pyrrolin-2-ones with broad substrate scope.
R.-Q. Ran, J. He, S.-D. Xiu, K.-B. Wang, C.-Y. Li, Org. Lett., 2014, 16, 3704-3705.


Regioselective ring closing ene-yne metathesis provided an efficient access to different substituted 1-benzazepine scaffolds. Five- and six-membered lactams were efficiently prepared by ring-closing metathesis affording highly functionalizable compounds.
E. Benedetti, M. Lomazzi, F. Tibiletti, J.-P. Goddard, L. Fensterbank, M. Malacria, G. Palmisano, A. Penoni, Synthesis, 2012, 44, 3523-3533.


Dimethyl sulfoxide (DMSO) and N-iodosuccinimide mediate a metal-free regioselective 5-exo-dig oxidative cyclization of propargyl-substituted ynamides via in situ generated enol equivalents. The reaction allows easy access to functionalized pyrrolidone skeletons. The role of DMSO as oxidant in the transformation is clarified, and a tentative reaction pathway is proposed.
B. Prabagar, S. Nayak, R. Prasad, A. K. Sahoo, Org. Lett., 2016, 18, 3066-3069.


Conventional approaches for the synthesis of tetramic acid derivatives often require highly functionalized starting materials and harsh heating conditions in basic media. A a silver-catalyzed strategy enables a mild synthesis of tetramic acid derivatives from easily available propargylic amines and carbon dioxide in the presence of DBU.
T. Ishida, R. Kobayashi, T. Yamada, Org. Lett., 2014, 16, 2430-2433.