Catalytic Enantioselective Addition of Dialkylzinc Reagents to<i>N</i>-Acylpyridinium Salts
作者:M.â
Ãngeles Fernández-Ibáñez、Beatriz Maciá、Mariaâ
Gabriella Pizzuti、Adriaanâ
J. Minnaard、Benâ
L. Feringa
DOI:10.1002/anie.200904981
日期:2009.11.23
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.
一小撮盐:将二烷基锌试剂首次催化添加到N-酰基吡啶鎓盐中,具有良好的收率和出色的对映选择性,使用的是铜-(S)-L络合物作为催化剂。该方法的多功能性在生物碱(R)-i氨酸的形式合成中得到了说明。Bn =苄基,Tf =三氟甲磺酰基。