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trans-1-sulfonylamino-2-isoborneolsulfonylaminocyclohexane derivatives: Excellent chiral ligands for the catalytic enantioselective addition of organozinc reagents to ketones

机译:反式-1-磺酰基氨基-2-异冰片磺酰基氨基环己烷衍生物:出色的手性配体,可将有机锌试剂催化对映选择性地加成酮

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摘要

The catalytic enantioselective addition of different organozinc reagents (such as alkyl and aryl derivatives or in situ generated aryl, allyl alkenyl, and alkynyl derivatives obtained through different transmetallation processes) to simple ketones has been accomplished by using titanium tetra-isopropoxide and chiral ligands derived from substituted trans-1-sulfonyl amino-2-isoborneolsulfonylaminocyclohexane, producing the corresponding tertiary alcohols with enantiomeric excesses (ee) up to > 99%. A simple and efficient procedure for the synthesis of the chiral ligands used in these reactions is described.
机译:通过使用四异丙醇钛和衍生自手性配体的方法,已将不同的有机锌试剂(例如烷基和芳基衍生物或通过不同的金属转移过程获得的原位生成的芳基,烯丙基烯基和炔基衍生物)催化对映选择性加成到简单的酮上。取代的反式-1-磺酰基氨基-2-异冰片酚磺酰基氨基环己烷,生成相应的叔醇,对映体过量(ee)最高> 99%。描述了一种合成这些反应中使用的手性配体的简单有效的方法。

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