Stereoselective synthesis of substituted 1,2-ethylenediaziridines and their use as ligands in palladium-catalyzed asymmetric allylic alkylation
作者:Andrea Gualandi、Francesco Manoni、Magda Monari、Diego Savoia
DOI:10.1016/j.tet.2009.11.062
日期:2010.1
2-ethylenediaziridines bearing one substituent/stereocenter on the ring carbon and one, two or no substituents/stereocenters in the ethylene tether. These bis(aziridines) were used as ligands in the Pd-catalyzed allylic alkylation of dimethyl malonate. It was established that the substituent(s) in the carbon tether and the configuration of the corresponding stereocenters have limited influence on the
将有机金属试剂双加到由乙二醛和(S)-苯基甘醇制备的熔融恶嗪-恶嗪中,根据有机金属试剂的性质,得到C 2-或C 1对称的1,2-亚乙基双(β-氨基醇)。通过使用(S)-缬氨醇和苯乙二醛为原料,并通过乙硼烷还原恶嗪-恶嗪。β-氨基醇部分的环化得到在环碳上带有一个取代基/立体中心和在乙烯系链中带有一个,两个或没有取代基/立体中心的1,2-亚乙基二氮丙啶。这些双(氮丙啶)在丙二酸二甲酯的钯催化的烯丙基烷基化反应中用作配体。已经确定,碳系链中的取代基和相应的立体中心的构型对对映选择性的影响有限。