Stereocontrolled Synthesis of <i>trans</i>/<i>cis</i>-2,3-Disubstituted Cyclopropane-1,1-diesters and Applications in the Syntheses of Furanolignans
作者:Yue Shen、Jun Chai、Gaosheng Yang、Wenlong Chen、Zhuo Chai
DOI:10.1021/acs.joc.8b01798
日期:2018.10.19
A new Michael addition/intramolecular alkylation sequence of (Z)-3-(2-bromo-3-arylacryloyl)oxazolidin-2-ones and malonates was developed. By a simple switch of the reaction conditions including the base promoter, solvent, and reaction temperature, both of the cis- and trans-isomers of a series of oxazolidinone-containing 2,3-disubstituted cyclopropane-1,1-diesters could be obtained in good-to-excellent
建立了新的(Z)-3-(2-溴-3-芳基丙烯酰基)恶唑烷-2-酮和丙二酸酯的迈克尔加成/分子内烷基化序列。通过简单地改变反应条件,包括碱助催化剂,溶剂和反应温度,就可以得到一系列含恶唑烷酮的2,3-二取代的环丙烷-1,1-二酯的顺式和反式异构体。产量极佳,非对映选择性极好。在(±)-尿嘧啶和(±)-维他汀的立体异构体的非对映选择性合成中证明了环丙烷产物的效用,涉及以醛或胡椒醛为关键步骤的AlCl 3促进的[3 + 2]环化。