DBN(DBU)、苯丙炔Weinreb酰胺參與的含氮雜環(huán)的合成及結(jié)構(gòu)鑒定
[Abstract]:(DBN) and (DBU) are two organic compounds with strong alkalinity. They have been widely used in many chemical reactions such as isomerization, elimination, condensation, cyclization and so on. More and more literatures report that "non-nucleophilic reagent" DBU,DBN can participate in the reaction as nucleophilic reagent under certain conditions. Through esterification, bromine addition, elimination and amidation, N-methyl-N-methoxyphenylpropargyl amidation was synthesized from cinnamic acid (ester). The heterocyclic products with different structures were obtained by the reaction of these compounds with DBN,DBU. The structure of the product was characterized by 1H-NMR-13C-NMR-DEPT-135H-1H COSY,HSQC,HMBC and NOESY and high resolution mass spectrometry (HRMS). At the same time, the effects of temperature and the amount of solvent DBN on the reaction were studied. The experimental results show that two kinds of closed loop products, I and III, have been obtained by reacting with phenylpropylidene acetylidene Weinreb amides. Two kinds of closed-loop products, I and III, have been obtained simultaneously to obtain the ring-opening product II (IV). Finally, three possible reaction mechanisms are proposed. In the reaction, DBU was used as nucleophilic reagent, the acetylene bond of phenylpropyne Weinreb amide was first attacked by nitrogen, and finally the product I was obtained, while DBU as nucleophilic reagent first attacked the acetylene bond of Weinreb amide, and finally obtained the product III.. Due to the influence of foreign water molecules, the closed-loop products are obtained at the same time of competitive reaction, and the ring opening products II or IV. are obtained.
【學(xué)位授予單位】:浙江工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O626
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