(2R,3R)-3-[(1R)-1-{[tert-Butyl(dimethyl)silyl]oxy}ethyl]-4-oxoazetidin-2-yl Acetate in Zinc- and Samarium-Promoted Substitution Reactions with Methyl 2-Bromopropanoate and Methyl (2-Bromomethyl)prop-2-enoate. Unusual Cleavage of the N1‒C4 Bond in Azetidin-2-one Derivative with Migration of Methoxycarbonyl Group in Synthetic Approaches to Carbapenems and Their Analogs
作者:Z. R. Valiullina、L. S. Khasanova、N. K. Selezneva、L. V. Spirikhin、Yu. N. Belokon’、M. S. Miftakhov
DOI:10.1134/s1070428018070096
日期:2018.7
l(dimethyl) silyl]oxy}ethyl]-1-(2-methoxy-2-oxoethyl)-4-oxoazetidin-2-yl}-2(RS)-methyl-3-oxopentanoate which underwent fragmentation through cleavage of the N1–C4 bond under the action of sodium bis(trimethylsilyl)-amide in THF at–78°C. The resulting acyclic amide, dimethyl (2R,S,3Z)-2-[(1R)-1-[tert-butyl(dimethyl)-silyl]oxy}ethyl)]-4-methyl-5-oxohept-3-enoylamino}malonate, was smoothly converted
锌在(2 R,3 R)-3-[(1 R)-1-[叔丁基(二甲基)甲硅烷基]氧基}-乙基] -4-氧杂ze啶-2-基的Barbier型反应中的使用具有卤素衍生物的乙酸乙烯酯导致形成预期的取代产物。标题化合物与由sa粉,催化量的碘和2-溴丙酸甲酯在THF中制备的试剂反应,得到异常取代产物2-(2 S,3 S)-3-[(1 R)-1-[[叔丁基(二甲基)甲硅烷基]氧基}乙基] -4-氧杂氮杂环丁烷-2-基} -2(R,S)-3-氧戊酸甲酯 后者与溴乙酸甲酯烷基化,得到2-(2 S,3 S)-3-[(1 R)-1-[叔丁基(二甲基)甲硅烷基]氧基}乙基] -1-(2-甲基)甲氧基-2-氧乙基)-4-氧杂氮杂环丁烷-2-基} -2(RS)-3-氧戊酸甲酯,在双(三甲基甲硅烷基)-酰胺钠的作用下,通过裂解N 1 -C 4键进行裂解在–78°C下的THF中。生成的无环酰胺二甲基(2 R,S,3