Titanium Alkoxide-Based Method for Stereoselective Synthesis of Functionalized Conjugated Dienes
作者:Takashi Hamada、Daisuke Suzuki、Hirokazu Urabe、Fumie Sato
DOI:10.1021/ja9905694
日期:1999.8.1
hydrolysis, deuteriolysis, or iodinolysis, gave diene 8, or its bis-deuterated (>99% d2) and bis-iodinated counterparts (9 and 10), in good yields and with high selectivities. This reaction is applicable to the cross-coupling reaction of functionalized acetylenes such as 2-alkynoates and 2-alkynamides 12−18 and a variety of terminal acetylenes 24−28 to give dienes 36−50 in good yields. A terminal acetylene
用低价钛试剂 (η2-propene)Ti(Oi-Pr)2 (1) 处理由 Ti(Oi-Pr)4 轻松制备的内乙炔,例如 1-甲硅烷基-1-辛炔 (3)和 i-PrMgCl 原位生成乙炔-钛络合物。使该配合物与末端乙炔、4-(苄氧基)-1-丁炔 (5) 反应,得到中间体二氧化钛环戊二烯 (6),在水解、氘化或碘解后,得到二烯 8 或其双-氘化(>99% d2)和双碘化对应物(9 和 10),产率高,选择性高。该反应适用于功能化乙炔如2-炔酸酯和2-炔酰胺12-18与多种末端乙炔24-28的交叉偶联反应,以良好的收率得到二烯36-50。