The one-pot reaction of 2-tert-butylsulfanyl-3-phenyl- or pyrrolidin-1-yl-cyclopropenethiones 1 and 2 with lithium pyrrolidinide or phenyllithium at –70 °C, followed by methylation with methyl iodide, gives 6-methylsulfanyl-5-phenyl-2,3-dihydro-1H-pyrrolizine 3 in a high yield.
Y. Yagyu, M. Ito, N. Matsumura, H. Inoue, K. Mizuno and T. Adachi, J. Chem. Soc., Perkin Trans. 1, 1998, 1175 DOI: 10.1039/A800355F
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