On the Effect of Tether Composition on<i>cis</i>/<i>trans</i>Selectivity in Intramolecular Diels-Alder Reactions
作者:Michael N. Paddon-Row、Alistair I. Longshaw、Anthony C. Willis、Michael S. Sherburn
DOI:10.1002/asia.200800352
日期:2009.1.5
[XZ=CH2CH2 (1); OC(O) (2); CH2C(O) (3); OCH2 (4); NHC(O) (5); SC(O) (6); OC(S) (7); NHC(S) (8); SC(S) (9)]. For each system studied (1–9), cis‐ and trans‐TS isomers, corresponding, respectively, to endo‐ and exo‐positioning of the CXZ tether with respect to the diene, have been located and their relative energies (ErelTS) employed to predict the cis/trans IMDA product
分子内Diels–Alder(IMDA)过渡结构(TSs)和能量已在B3LYP / 6‐31 + G(d)和CBS‐QB3的理论水平上对一系列1,3,8-壬二烯,H 2进行了计算CCH CHCH CH 2 X ž CHCH 2 [ X ž = CH 2 CH 2 (1); ø C(O)(2); CH 2 C(O)(3); ø CH 2 (4); NH C(O)(5); 小号 C(O)(6); ø C(S)(7); NH C(S)(8); š C(S)(9)]。对于每个研究的系统(1 – 9),顺式-和反式-TS异构体,分别对应于内切-和外切-positioning所述的 Ç X Ž 相对于系绳至二烯,已经被定位和它们的相对能量(Ë相对TS)用