Ethyl 3-alkyl-4-hydroxy-2-thioxothiazolidine-4-carboxylates were prepared in excellent yields from the reaction of corresponding primary amines with carbon disulfide and ethyl 3-bromo-2-oxopropanoate in the presence of anhydrous potassium phosphate in DMF at room temperature within 1 h. The structures of the highly functionalized products were corroborated spectroscopically （IR, ^1H NMR, ^13C NMR, EI-MS） and by elemental analyses. A plausible mechanism for such type of cyclization was proposed.
对4-氯-2-甲基-5,7-二氢噻吩并[3,4-d]嘧啶6,6-二氧化物为原料合成2-甲基-5,7-二氢噻吩并[3,4-d]嘧啶6,6-二氧化物的方法进行了改进.与文献报道的Pd-C/H2脱氯方法相比,用新的甲苯-锌粉-氢氧化钠溶液-TBAB体系常压脱氯,简便易行,避免了加氢脱氯的危险性,降低了成本,产物收率达92%.对反应条件进行了优化:甲苯为溶剂,TABA为相转移催化剂,n(4-氯嘧啶二氧化物)∶n(Zn)∶n(NaOH)=1∶10∶20,温度100℃,反应时间2 h.
Based on the principle of association, a novel class of cyclophosphamide bis-spiropiperazinium compounds was designed and synthesized. A new method of synthesis, separation and purification for this kind of compounds was also developed.
In order to improve the antitumor activity and reduce the toxicity of the alkylating agent chlorambucil, a series of spiropiperazinium salts of chlorambucil （8） were designed and synthesized. It was found that compound 8f exhibited potential in vivo activity against H22.
A new strategy for the modification of cyclophosphamide was carried out and three series of new cyclophosphamide piperazinium salts 10,11 and 13 were prepared.These compounds,based on compound 9i scaffold,were evaluated for their in vivo anticancer activities against hepatocyte sarcoma 22 （H 22）.The structure-activity relationship study reveals that 1） the conformation and the substituent at N-3 of cyclophosphamide spiropiperazinium salts 10 greatly affect the activity 2） different kinds of cyclophosphamide non-spiropiperazinium derivatives 11 show different activities 3） for 1,2-benzisoxazole phosphoropiperazinium salts 13,it is possible to obtain anticancer drug candidates with suitable quaternary ammonium moiety.These results would help to further design and synthesize analogs of mustard anticancer drugs.
