生物活性方面,α-羟基他莫昔芬是他莫昔芬的代谢产物,在缺乏代谢酶的情况下能够与DNA相互作用,从而导致DNA加合物的形成。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | trans-α-acetoxytamoxifen | 205924-32-9 | C28H31NO3 | 429.559 |
—— | (E,Z)-4-[4-(2-dimethylaminoethoxy)phenyl]-3,4-diphenyl-but-3-en-2-one | 556834-76-5 | C26H27NO2 | 385.506 |
(E,Z)-1-溴-2-[4-[2-(二甲基氨基)乙氧基]苯基]-1,2-二苯基乙烯 | trans-(E)-1-bromo-2-<4-<2-(dimethylamino)ethoxy>phenyl>-1,2-diphenylethene | 19118-19-5 | C24H24BrNO | 422.365 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (2R)-(E)-4-{4-[2-(dimethylamino)ethoxy]phenyl}-3,4-diphenyl-3-buten-2-ol | —— | C26H29NO2 | 387.522 |
—— | (2S)-(E)-4-{4-[2-(dimethylamino)ethoxy]phenyl}-3,4-diphenyl-3-buten-2-ol | —— | C26H29NO2 | 387.522 |
N-去甲基(E)-alpha-羟基他莫昔芬 | alpha-Hydroxy-N-desmethyltamoxifen | 162070-61-3 | C25H27NO2 | 373.495 |
The tamoxifen carbocation (Ph(Ar)C=CPh-CH+-CH3, Ar = 4-Me2NCH2CH2OC6H4) is generated from acetate and sulfate precursors by SN1 ionization in water. The cation exists in (E) and (Z) forms which equilibrate before reaction. The major products are the α-hydroxytamoxifens Ph(Ar)C=CPh-CHOH-CH3, both (E) 64% and (Z) 29%, with the ratio independent of the configuration of the starting ester. Two minor products with a total yield of 7% account for the rest of the products. These have been characterized as indenes derived from intramolecular cyclization, a 4.5% yield of the indene derived from cyclization into the Ar ring with 2.5% due to cyclization into the phenyl ring. Experiments in acid solutions (0.01-0.1 M HCl) starting with pure (E)- or (Z)-α-hydroxytamoxifen reveal that the two alcohols equilibrate. This occurs by H+-catalyzed formation of the carbocation followed by water capture. Occurring about 10-fold slower than this isomerization is an irreversible process resulting in the two indenes. This cyclization will result in the destruction of the α-hydroxytamoxifens upon exposure to acidic conditions and also makes the direct observation of the tamoxifen carbocation under super-acid conditions difficult, if not impossible. The indenes do form in low yield whenever the tamoxifen carbocation is generated from an SN1 precursor. Thus these products could serve as markers for the formation of the tamoxifen carbocation in cellular systems or in in vivo experiments.Key words: carbocation, indene, allylic cation, isomerization.