A. Bayer et Or. Gautun, Asymmetric N-sulfinyl dienophile Diels-Alder cycloadditions using chiral Ti(IV)-based Lewis acids, TETRAHEDR L, 41(19), 2000, pp. 3743-3746
Enantioselective Diels-Alder reactions of 1,3-cyclohexadiene with N-sulfiny
lbenzyl carbamate (1a) or N-sulfinyl-p-toluenesulfonamide (1b) promoted by
chiral Ti(IV)-based Lewis acids are reported. The endo-adducts were obtaine
d in 15-76% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.