Titanocene(II)-Promoted Cyclization of Unsaturated Thioacetals
作者:Tooru Fujiwara、Takeshi Takeda
DOI:10.1055/s-1999-2618
日期:1999.3
The low-valent titanium species-promoted transformation of unsaturated thioacetals to cyclic compounds was studied. The cyclization of thioacetals having an olefin moiety proceeded with the loss of terminal olefin carbon to produce the corresponding five-, six-, and seven-membered cycloalkenes when they were treated with the low-valent titanium species Cp2Ti[P(OEt)3]2 in refluxing THF. The similar reactions of 1-[3,3-bis(phenylthio)propoxy]-2-(prop-1- and prop-2-enyl)benzenes gave the seven- and eight-membered unsaturated cyclic ethers, respectively.
Titanocene(II)-promoted reaction of gem-dihalides possessing a terminal double bond. New intramolecular cyclopropanation
作者:Tooru Fujiwara、Miho Odaira、Takeshi Takeda
DOI:10.1016/s0040-4039(01)00465-8
日期:2001.5
The Cp2Ti[P(OEt)3]21-promoted intramolecular reaction of gem-dihalides possessing a terminal double bond is described. The treatment of 6,6- and 7,7-dihalo-1-alkenes with 1 produced bicyclo[3.1.0]hexane and bicyclo[4.1.0]heptane derivatives, respectively.
描述了具有末端双键的宝石-二卤化物的Cp 2 Ti [P(OEt)3 ] 2 1促进的分子内反应。的6,6-和7,7-二卤代-1-烯烃与处理1个分别制备双环[3.1.0]己烷和双环[4.1.0]庚烷衍生物。
Ring-Closing Metathesis of Titanium–Carbene Complexes Prepared from Thioacetals Having a Carbon–Carbon Double Bond
作者:Tooru Fujiwara、Yoshiko Kato、Takeshi Takeda
DOI:10.1016/s0040-4020(00)00201-5
日期:2000.7
The ring-closing metathesis proceeded to give cycloalkenes in good yields when diphenyl thioacetals having a carbon-carbon double bond were treated with the low-valent titanium species Cp2Ti[P(OEt)(3)](2) in THF at room temperature and then at reflux. This methodology is successfully applied to the preparation of cyclic ethers and sulfides. (C) 2000 Published by Elsevier Science Ltd.