Chemistry of nitrosoureas. Intermediacy of 4,5-dihydro-1,2,3-oxadiazole in 1,3-bis(2-chloroethyl)-1-nitrosourea decomposition
作者:Robert B. Brundrett
DOI:10.1021/jm00185a021
日期:1980.11
glycol, was identified from BCNU [1,3-bis(2-chloroethyl)-1-nitrosourea] decomposition. The variation of ethylene glycol yield with pH indicates that there are two competing mechanisms of decomposition. At pH 7.4 the decomposition is predominantly through 2-chloroethyldiazohydroxide, an chloroethanol and acetaldehyde are the major products. At pH 5, the decomposition is predominantly through 4,5-dihydro-1
从BCNU [1,3-双(2-氯乙基)-1-亚硝基脲]分解物中鉴定出一种新产物乙二醇。乙二醇收率随pH的变化表明存在两种竞争的分解机理。在pH 7.4时,分解主要通过2-氯乙基重氮氢氧化物进行,主要产物为氯乙醇和乙醛。在pH 5时,分解主要通过4,5-二氢-1,2,3-恶二唑和2-羟乙基重氮氢氧化物进行,而乙二醇和乙醛是主要产物。氘标记表明,在两个pH值下,乙醛都是通过涉及氢化物转移的机理而产生的。在存在溴化物的pH值为5的情况下,2-溴乙醇是主要产物,氘标记显示羟基主要存在于碳中,该碳携带BCNU中的氯。