[6π+2π]-Cycloaddition of α,ω-Diallenes and α,ω-Diacetylenes to 1,3,5-Cycloheptatriene in the Presence of TiCl4-Et2AlCl
摘要:
[6 pi+2 pi]-Cycloaddition of alpha,omega-diallenes and alpha,omega-bis(trimethylsilyl)diacetylenes to 1,3,5-cycloheptatriene in the presence of a two-component catalytic system TiCl4-Et2AlCl was performed that led to the formation of bis(endo-bicyclo[4.2.1]nona-2,4-dienes) and bis(8-trimethylsilyl-endo-bicyclo[4.2.1]nona-2,4,7-trienes) linked by polymethylene spacer in 69-86% yields.
Cobalt‐Catalyzed Intermolecular [2+2] Cycloaddition between Alkynes and Allenes
作者:Wei Ding、Naohiko Yoshikai
DOI:10.1002/anie.201813283
日期:2019.2.18
An intermolecular [2+2] cycloaddition reaction between an alkyne and an allene is reported. In the presence of a cobalt(I)/diphosphine catalyst, a near equimolar mixture of the alkyne and allene is converted into a 3‐alkylidenecyclobutene derivative in good yield with high regioselectivity. The reaction tolerates a variety of internal alkynes and mono‐ or disubstituted allenes bearing various functional
First example of one-pot synthesis of hydrocarbon macrorings
作者:U. M. Dzhemilev、A. G. Ibragimov、V. A. D’yakonov、M. Pudas、U. Bergmann、L. O. Khafizova、T. V. Tyumkina
DOI:10.1134/s1070428007050089
日期:2007.5
Cyclomagnesation of alpha,omega-diallenes by EtMgBr in the presence of chemically activated Mg and Cp2TiCl2 catalyst led to the formation of cyclic organomagnesium compounds whose hydrolysis provided gigantic hydrocarbon macrorings with 1,5-cis-disubstituted double bonds.