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oai:docta.ucm.es:20.500.14352/984622024-04-29T17:58:59Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Viso Beronda, Alma author Fernández de la Pradilla, Roberto author García Suárez, Ana Beatriz author Guerrero-Strachan, Carlos author Alonso Rodríguez, Marta Isabel author Tortosa Manzanares, Mariola author Flores Aguilar-Amat, Aída author Martínez-Ripoll, Martín author Fonseca Ruiz, Isabel author André, Isabelle author Rodríguez Fernández-Pacheco, Ana María author 2003-06-06 A new procedure for the asymmetric synthesis of imidazolidines and vicinal diamines is reported. The 1,3-dipolar cycloaddition between nonracemic p-tolylsulfinimines and azomethine ylides generated in situ from α-iminoesters and LDA produces N-sulfinylimidazolidines with a high degree of stereocontrol. In contrast, the presence of Lewis acids promotes formation of the cycloadducts through a highly diastereoselective process with opposite stereochemistry. Subsequent transformations of the imidazolidines including oxidative, reductive, and hydrolytic processes that provide easy access to vicinal diaminoalcohols have been explored. Among these, reductive cleavage of the aminal with LiAlH4 is an extremely efficient and general reaction for the synthesis of enantiopure N-sulfinyl-N′-benzyldiaminoalcohols. 10.1002/chem.200204674 https://hdl.handle.net/20.500.14352/98462 https://doi.org/10.1002/chem.200204674 Highly Diastereoselective [3 2] Cycloadditions between Nonracemic p-Tolylsulfinimines and Iminoesters:An Efficient Entry to Enantiopure Imidazolidines and Vicinal Diaminoalcohols