Reductive Coupling of Terpenic Allylic Halides Catalyzed by Cp2TiCl: A Short and Efficient Asymmetric Synthesis of Onocerane Triterpenes
摘要:
Titanocene chloride catalyzes the regioselective alpha,alpha '-homocoupling of terpenic allylic halides. This process has been employed in the short and effective synthesis of terpenoids such as beta-onoceradiene (1), beta-onocerin (2), and squalene (3). Evidence is presented for eta(1)-allyltitanium species being involved in the coupling.
Titanocene dichloride complexes bonded to carbosilane dendrimers via a spacer of variable length – Molecular dynamics calculations and catalysis of allylic coupling reactions
作者:Tomáš Strašák、Florian Jaroschik、Marek Malý、Jan Čermák、Jan Sýkora、Radek Fajgar、Jindřich Karban、Dominique Harakat
DOI:10.1016/j.ica.2013.07.020
日期:2014.1
SiCH 2 CH 2 CH 2SiMe2 CH 2 CH 2SiMe2 (CH 2 ) n C 5 H 4TiCl2 C 5 H 5 } 4 and SiCH 2 CH 2 CH 2SiMe[CH 2 CH 2SiMe2 (CH 2 ) n C 5 H 4TiCl2 C 5 H 5 ] 2 } 4 ( n = 1, 5) and of the second generation SiCH 2 CH 2 CH 2SiMe[CH 2 CH 2 CH 2SiMe2 CH 2 CH 2SiMe2 (CH 2 ) n C 5 H 4TiCl2 C 5 H 5 ] 2 } 4 ( n = 1, 5) and SiCH 2 CH 2 CH 2SiMe[CH 2 CH 2 CH 2SiMe(CH 2 CH 2SiMe2 (CH 2 ) n C 5 H 4
摘要第一代Si CH 2 CH 2 CH 2 SiMe 2 CH 2 CH 2 SiMe 2(CH 2)n C 5 H 4 TiCl 2 C 5 H 5} 4和Si CH 2 CH 2 CH 2 SiMe [CH 2 CH 2 SiMe 2(CH 2)n C 5 H 4 TiCl 2 C 5 H 5] 2} 4(n = 1,5)和第二代Si CH 2 CH 2 CH 2 SiMe [CH 2 CH 2 CH 2 SiMe 2 CH 2 CH 2 SiMe 2(CH 2)n C 5 H 4 TiCl 2 C 5 H 5] 2} 4(n = 1,5)和Si CH 2 CH 2 CH 2 SiMe [CH制备2 CH 2 CH 2 SiMe(CH 2 CH 2 SiMe 2(CH 2)n C 5 H 4 TiCl 2 C 5 H 5)2] 2} 4(n = 5),使用GPC-NMR和GP
Kasatkin, A. N.; Kulak, A. N.; Tolstikov, G. A., Journal of Organic Chemistry USSR (English Translation), 1988, vol. 24, # 10, p. 1875 - 1889
作者:Kasatkin, A. N.、Kulak, A. N.、Tolstikov, G. A.、Lomakina, S. I.
DOI:——
日期:——
187. Experiments relating to the synthesis of homogeranic acid
作者:D. Barnard、L. Bateman
DOI:10.1039/jr9500000926
日期:——
Reductive Coupling of Terpenic Allylic Halides Catalyzed by Cp<sub>2</sub>TiCl: A Short and Efficient Asymmetric Synthesis of Onocerane Triterpenes
作者:Alejandro F. Barrero、M. Mar Herrador、José F. Quílez del Moral、Pilar Arteaga、Jesús F. Arteaga、María Piedra、Elena M. Sánchez
DOI:10.1021/ol050335r
日期:2005.6.1
Titanocene chloride catalyzes the regioselective alpha,alpha '-homocoupling of terpenic allylic halides. This process has been employed in the short and effective synthesis of terpenoids such as beta-onoceradiene (1), beta-onocerin (2), and squalene (3). Evidence is presented for eta(1)-allyltitanium species being involved in the coupling.
Soucek,M. et al., Collection of Czechoslovak Chemical Communications, 1961, vol. 26, p. 2551 - 2556