Levocetirizine Dihydrochloride was prepared from benzoyl chloride by acidylation,hydrogenation,cyclization with an overall yield of 8.05%.

以苯甲酰氯为原料,经酰,还原,环合等反应合成左旋西替利嗪盐酸盐,反应总收率为8.05%。

Application of samarium diiodide in mediating intramolecular cyclization reactions was reviewed.

综述了二碘钐在分子内环反应中的应。

Method The target compound was synthesized from clarithromycin via hydrolyzation,acetylation,cyclic carbonatation,oxidation,decarbonatation,acylation,cyclic carbamatation and cyclization.

方法以克拉霉素为起始原料,经水解、乙酰、环酸酯、氧、脱酸酯、酰、环氨基甲酸酯和环合等反应合成目标合物。

N butyl 2 ethoxy thioacridone was prepared from o chloro benzoic acid and p phenetidine by means of Ullman reaction,cyclization,N alkylation and sulfurization.

以邻氯苯甲酸和对乙氧基苯胺为原料,经过胺的苯基、二芳胺的环、N-烷基、硫反应合成了N-丁基-2-乙氧基硫酮。

This paper reports the improvement on the synthesis of 5 methylisoxazol 3 formamide by Claisen condensation of diethyl oxalacetate followed by cyclization and ammonolysis.

讨论了以草酸二乙酯为原料,经过克莱森缩合、环合、氨解反应合成5甲基异唑3甲酰胺工艺的改进。

In this paper, the synthesis of 2 - chloranthraquinone and 2 - aminoanthraquinone was studied.It was prepared from phthalic anhydride by acetyiation, hydrolysis and cyclization.

以苯酐和取苯为原料,经过乙酰、水解及环合反应,合成了2-氯蒽醌和2-氨基蒽醌,并对影响收率的工艺条件进行了研究。

Aqueous titanium trichloride promoted intermolecular reductive cyclization of 1,2 -diketone and o-nitroaniline in basic media provides a convenient method for the synthesis of quinoxaline derivatives.

本文研究了三氯钛水溶液下,邻硝基苯胺与1,2-二酮在碱性介质中分子间的成环反应,提供了一个方便地合成取喹喔啉类合物的方法。