作者:Moo Je Sung、Jin-Hyun Pang、Soon-Bong Park、Jin Kun Cha
DOI:10.1021/ol034592c
日期:2003.6.1
has been assessed for the isomerization-free preparation of 1,3-cyclohexadienes. The successful cycloaddition by titanium alkoxides is predicated on the use of homoallylic alcohols as the olefin component. With secondary homoallylic alcohols, high 1,3-diastereoselectivity is observed, which lends itself to enantioselective preparation of functionalized 1,3-cyclohexadienes.
[反应:见正文]与由芳基钛介导的已知的二炔-烯[2 + 2 + 2]环加成反应有关,已评估了钛醇盐促进钛环戊二烯与烯烃偶联的能力是否无异构化制备1,3-环己二烯。烷氧基钛能否成功进行环加成反应取决于使用均烯丙基醇作为烯烃组分。对于仲均烯丙基醇,观察到高的1,3-非对映选择性,这有助于官能化的1,3-环己二烯的对映选择性制备。