The first catalytic endo‐selective 1,3‐dipolar cycloaddition of azomethine ylides and vinyl phenyl sulfone has been developed successfully. The highly efficient silver acetate (AgOAc)/TF‐BiphamPhos catalytic system exhibited high reactivity, excellent diastereoselectivity (>98:2), good enantioselectivity (67–92% ee) and broad substrate scope under mild conditions.
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Liang et al. (2009) studied this question.
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