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    • 16. 发明授权
    • Process of preparing 1,3-bis(2-chloroethyl)-1-nitrosourea
    • 制备1,3-双(2-氯乙基)-1-亚硝基脲的方法
    • US4028410A
    • 1977-06-07
    • US523334
    • 1974-11-13
    • William H. YankoDonald E. Sharp
    • William H. YankoDonald E. Sharp
    • C07C275/68A61K31/17C07C67/00C07C239/00C07C127/15
    • A method of producing 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) by nitrosation of 1,3-bis(2-chloroethyl)-urea utilizing as a nitrosating agent dinitrogen trioxide (N.sub.2 O.sub.3) in molar excess of theoretical wherein the molar excess of N.sub.2 O.sub.3 ranges from 10-200% and preferably from 10-20%. The nitrosation reaction is conventionally carried out in the cold from 0.degree. C to -20.degree. C and a non-aqueous solvent is utilized. The preferred non-aqueous solvent is of the chlorinated variety; i.e., methylene dichloride. Other preferred solvents include related halogenated compounds such as ethylene dichloride, nitro-compounds such as nitromethane, acetonitrile, and simple ethers such as ethyl ether. Other less preferred but operable compounds include esters such as ethyl acetate, simple ketones such as acetones, and chloroform. Solvents to be avoided are olefins, unsaturated ethers and other unsaturated compounds, amines, malonate esters, acid anhydrides, and solvents which would interact with the reactant N.sub.2 O.sub.3 and the urea as well as the product nitrosourea.
    • 利用1,3-二(2-氯乙基) - 脲亚硝化三氧化二氮(N 2 O 3)摩尔过量的亚硝化剂生产1,3-双(2-氯乙基)-1-亚硝基脲(BCNU)的方法 其中N 2 O的摩尔过量为10-200%,优选为10-20%。 亚硝化反应通常在0℃至-20℃的冷气中进行,并使用非水溶剂。 优选的非水溶剂是氯化品种; 即二氯甲烷。 其它优选的溶剂包括相关的卤代化合物如二氯乙烷,硝基化合物如硝基甲烷,乙腈和简单醚如乙醚。 其它较不优选但可操作的化合物包括酯如乙酸乙酯,简单酮如丙酮和氯仿。 要避免的溶剂是烯烃,不饱和醚和其他不饱和化合物,胺,丙二酸酯,酸酐和与反应物N 2 O 3和尿素以及产物亚硝基脲相互作用的溶剂。