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Synthesis of 1-pyrrolines

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[RuCl2(CO)3]2/dppp is a highly effective catalyst system for the intramolecular oxidative amination of various aminoalkenes in presence of K2CO3 and allyl acetate in N-methylpiperidine to give the corresponding cyclic imines and indoles in excellent yields.
T. Kondo, T. Okada, T.-A. Mitsudo, J. Am. Chem. Soc., 2002, 124, 186-187.


Upon treatment with aqueous sodium hydroxide in DMF, a range of chalcones underwent Michael addition reactions with nitroalkanes. The resulting adducts were reduced in situ with Zn/HCl (aq) to afford substituted Δ1-pyrrolines in high yields after a cyclization.
Y. Liang, D. Dong, Y. Lu, Y. Wang, W. Pan, Y. Chai, Q. Liu, Synthesis, 2006, 3301-3304.


Pd-catalyzed intramolecular cyclizations of oxime esters with 1,2-dialkylated alkenes provide an entry to dihydropyrroles. Substrate and catalyst controlled strategies for selective product formation are outlined.
N. J. Race, J. F. Bower, Org. Lett., 2013, 15, 4616-4619.