Efficient and accurate characterization of the Bergman cyclization for several enediynes including an expanded substructure of esperamicin A1.
Efficient and accurate characterization of the Bergman cyclization for several enediynes including an expanded substructure of esperamicin A1.
复制标题
对几种烯二炔的 Bergman 环化进行高效、准确的表征,包括埃斯帕霉素 A1 的扩展子结构。
DOI:
10.1021/jp807341t
复制
发表时间:
2008
期刊:
影响因子:
--
通讯作者:
Shields,GeorgeC
中科院分区:
文献类型:
--
作者:
Sherer,EdwardC;Kirschner,KarlN;Pickard4th,FrankC;Rein,Chantelle;Feldgus,Steven;Shields,GeorgeC
Incorporation of enediynes into anticancer drugs remains an intriguing yet elusive strategy for the design of therapeutically active agents. Density functional theory was used to locate reactants, products, and transition states along the Bergman cyclization pathways connecting enediynes to reactive para-biradicals. Sum method correction to low-level calculations confirmed B3LYP/6-31G(d,p) as the method of choice in investigating enediynes. Herein described as MI:Sum, calculated reaction enthalpies differed from experiment by an average of 2.1 kcal·mol−1(mean unsigned error). A combination of strain energy released across the reaction coordinate and the critical intramolecular distance between reacting diynes explains reactivity differences. Where experimental and calculated barrier heights are in disagreement, higher level multireference treatment of the enediynes confirms lower level estimates. Previous work concerning the chemically reactive fragment of esperamcin, MTC, is expanded to our model system MTC2.
登录
查看更多内容
影响因子:
1.8
作者:
ROGERS, B;GRAHAM, M
通讯作者:
GRAHAM, M
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
H. Wallach;B. Gillam;L. Cardillo
通讯作者:
L. Cardillo
影响因子:
3
作者:
H. Wallach
通讯作者:
H. Wallach
DOI:
--
发表时间:
1980
期刊:
Perception & Psychophysics
影响因子:
--
作者:
Ann O’leary;H. Wallach
通讯作者:
H. Wallach
影响因子:
--
作者:
GIBSON, EJ;GIBSON, JJ;FLOCK, H
通讯作者:
FLOCK, H