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2005
Pyrrole derivatives
R 0120
A Highly Diastereoselective MgI2-Mediated Ring Expansion of Methylenecyclopropanes. — A novel one-step, highly diastereoselective tandem MgI2-mediated
02- 101 ring-opening/-closing
reaction is reported. 2,3,4-Trisubstituted pyrrolidine products are
obtained in good to excellent yields and with excellent diastereoselectivities. The use
of 1 equiv. MgI2 is crucial for the reaction rates and the yields, but not for the diastereoselectivities. — (SCOTT, M. E.; HAN, W.; LAUTENS*, M.; Org. Lett. 6 (2004) 19,
3309-3312; Davenport Res. Lab., Dep. Chem., Univ. Toronto, Toronto, Ont. M5S 3H6,
Can.; Eng.) — Steudel
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