Thioacetals are selectively transformed into two types of terminal olefins, one with one-carbon homologation and the other with two-carbon homologation, by treatment with a titanocene(II) species under ethylene. The mode of the reaction is controlled by changing the ligands coordinated to titanocene(II).
Titanocene(II)-promoted reaction of anilides with thioacetals followed by treatment with a small amount of water gave reductivealkylation products, anilines with a secondary alkyl group.
Cyclopropanes were obtained by the titanocene(II)-promoted reaction of thioacetals with vinyl pivalate. It was also found that vinycyclopropanes were produced by a similar treatment of thioacetals with the titanocene(II) species in the presence of 1,3-dienes. (C) 2004 Elsevier Ltd. All rights reserved.
Formation of pyrrolidines by the titanocene(II)-promoted intramolecular reaction of N-[3,3-bis(phenylthio)propyl]anilides
作者:Takeshi Takeda、Jun Saito、Akira Tsubouchi
DOI:10.1016/s0040-4039(03)01385-6
日期:2003.7
titanium carbene complexes generated by the desulfurization of thioacetals with the titanocene(II) species Cp2Ti[P(OEt)3]2 produced the corresponding enamines. Unusual formation of pyrrolidines was observed when N-[3,3-bis(phenylthio)propyl]anilides were treated with the titanocene(II) reagent.
乙醛与硫代缩醛与钛茂(II)物种Cp 2 Ti [P(OEt)3 ] 2脱硫生成的钛卡宾配合物反应生成相应的烯胺。当用钛茂(II)试剂处理N- [3,3-双(苯硫基)丙基]苯胺时,观察到吡咯烷的异常形成。