A pinch of salt: The first catalytic addition of dialkylzinc reagents to N-acylpyridinium salts with good yields and excellent enantioselectivities uses a copper–(S)-L complex as the catalyst. The versatility of the method is illustrated in the formal synthesis of the alkaloid (R)-coniine. Bn=benzyl, Tf=trifluoromethanesulfonyl.
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