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The rapid developments in the field of catalytic enantioselective 1,3-dipolar cycloaddition reactions of nitrones which have occurred during the last six years are reported. A series of catalysts has been applied for both the normal electron-demand and inverse electron-demand 1,3-dipolar cycloaddition reaction of nitrones with electron-deficient and electron-rich alkenes, respectively. In several cases a high degree of control of both the diastereo- and enantioselectivity has been achieved.
Gothelf et al. (Sat,) studied this question.