Enantioselective Copper‐Catalysed Allylic Alkylation of Cinnamyl Chlorides by Grignard Reagents using Chiral Phosphine‐Phosphite Ligands
作者:Wibke Lölsberg、Shute Ye、Hans‐Günther Schmalz
DOI:10.1002/adsc.201000213
日期:2010.10.9
copper(I)-catalysed SN2′-type allylicsubstitution of E-3-aryl-allyl chlorides (cinnamyl chlorides) using Grignard reagents represents a powerful method for the synthesis of compounds carrying a benzylic stereocentre. By screening a small library of modular chiral phosphine-phosphite ligands a new copper(I)-based catalyst system was identified which allows the performance of such reactions with exceptional high
使用格氏试剂的铜(I)催化的E -3-芳基-烯丙基氯化物(肉桂酰氯)的S N 2'型烯丙基取代代表了一种合成具有苄基立体中心的化合物的有效方法。通过筛选小的模块化手性膦-亚磷酸酯配体文库,确定了一种新的基于铜(I)的催化剂体系,该体系可以以极高的区域和对映体选择性进行此类反应。使用TADDOL衍生的配体(3 mol%),溴化铜(I)·二甲基硫醚(CuBr·SMe 2)(2.5 mol%)和甲基叔丁基醚(MTBE)获得最佳结果。制备了具有高达99%ee的各种(1-烷基-烯丙基)苯衍生物(GC)的分离产率高达99%。在大多数情况下,产物包含少于3%的线性区域异构体(除了邻位取代的底物)。富电子和电子不足的肉桂酰氯均已成功使用。通过比较实验和计算出的CD光谱来确定产品的绝对构型。通过与亚硫酰氯反应,由相应的醇制备底物。通过在MTBE中在三苯基膦(PPh 3)(3mol%)的存在下在低温下用CuBr·SMe
EP2248423
申请人:——
公开号:——
公开(公告)日:——
COMPOSITION FOR AGRICULTURAL USE FOR CONTROLLING OR PREVENTING PLANT DISEASES CAUSED BY PLANT PATHOGENS
申请人:Matsuzaki Yuichi
公开号:US20110009454A1
公开(公告)日:2011-01-13
Disclosed is a composition for agricultural use, which is used for controlling or preventing plant diseases caused by plant pathogens. The composition for agricultural use contains a compound represented by formula (1), a salt thereof or a hydrate of the compound or the salt. (1) [In the formula, Z represents an oxygen atom, a sulfur atom or NR
Z
; and E represents a furyl group, a thienyl group, a pyrrolyl group, a tetrazolyl group, a thiazolyl group, a pyrazolyl group, a phenyl group or the like.]