2026-06-08T02:38:59Zhttps://docta.ucm.es/rest/oai/request

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

Viso Beronda, Alma Fernández de la Pradilla, Roberto García Suárez, Ana Beatriz Guerrero-Strachan, Carlos Alonso Rodríguez, Marta Isabel Tortosa Manzanares, Mariola Flores Aguilar-Amat, Aída Martínez-Ripoll, Martín Fonseca Ruiz, Isabel André, Isabelle Rodríguez Fernández-Pacheco, Ana María 2024-02-02T17:21:36Z 2024-02-02T17:21:36Z 2003-06-06 10.1002/chem.200204674 https://hdl.handle.net/20.500.14352/98462 https://doi.org/10.1002/chem.200204674 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. eng restricted access Highly Diastereoselective [3 2] Cycloadditions between Nonracemic p-Tolylsulfinimines and Iminoesters:An Efficient Entry to Enantiopure Imidazolidines and Vicinal Diaminoalcohols journal article