首页> 外文期刊>Chemistry: A European journal >Stereoselective palladium-catalyzed functionalization of homoallylic alcohols: A convenient synthesis of di- and trisubstituted isoxazolidines and β-amino-δ-hydroxy esters
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Stereoselective palladium-catalyzed functionalization of homoallylic alcohols: A convenient synthesis of di- and trisubstituted isoxazolidines and β-amino-δ-hydroxy esters

机译:立体选择性钯催化均烯丙基醇的官能化:二取代和三取代的异恶唑烷和β-氨基-δ-羟基酯的便捷合成

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摘要

Enantiopure, Boc-protected alkoxyamines 12 and 13, derived from the readily available homoallylic alcohols 4 via a reaction that involves either inversion or retention of configuration, undergo a diastereoselective Pd-catalyzed ring-closing carbonylative amidation to produce isoxazolidines 16/17 (≤50:1 diastereoisomer ratio (d.r.)) that can be readily converted into the N-Boc-protected esters of β-hydroxy acids and their substituted homologues 37. The key carbonylative cyclization proceeds through an unusual syn addition of the palladium and the nitrogen nucleophile across the CiC bond (19→21), as revealed by the reaction of 15, which afforded isoxazolidine 18 with high diastereoselectivity.
机译:对映纯的,由Boc保护的烷氧基胺12和13通过容易涉及的转化或保留构型的反应衍生自易得的均丙醇4,进行非对映选择性Pd催化的闭环羰基酰胺化反应生成异恶唑烷16/17(≤50 1:1的非对映异构体比率(dr),可以很容易地转化为N-Boc保护的β-羟基酸的酯及其取代的同系物37.关键的羰基化环化反应是通过钯和氮亲核试剂的不寻常的同加15的反应揭示了CiC键(19→21),得到具有高非对映选择性的异恶唑烷18。

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