[reaction: see text]. Addition of Bu3SnLi to tert-butanesulfinimines proceeds with high diastereoselectivities to provide the expected adducts in excellent yields and typically with dr = >99:1. These adducts are readily converted to enantiomerically enriched N-Boc-protected alpha-aminoorganostannanes with complete retention of configuration.
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Kells et al. (2003) studied this question.