Iridium complex-catalyzed method for the construction of a quaternary carbon center α to allene
摘要:
Ir(cod)Cl](2)/dppe-catalyzed allylic alkylation of 1,1-disubstituted-2,3-butadienyl acetates gives a product bearing a quaternary carbon center alpha to allene in high yield, (C) 2004 Elsevier Ltd. All rights reserved.
Construction of Highly Substituted Stereodefined Dienes by Cross-Coupling of α-Allenic Acetates
作者:John S. Schneekloth、Mathieu Pucheault、Craig M. Crews
DOI:10.1002/ejoc.200600721
日期:2007.1
The assembly of highlysubstituted dienes remains a challenge for organic chemistry. This work represents a strategyfor the construction of highlysubstituted 1,3-dienes by meansof a Tsuji–Trost cross coupling between α-allenic acetates and organozinc reagents. The reaction is high yielding, and installs a trisubstituted olefin with E/Z selectivities up to 95:5 favoring the (E) product. A cheap, commercially
Iridium complex-catalyzed method for the construction of a quaternary carbon center α to allene
作者:Satoko Kezuka、Kazuyuki Kanemoto、Ryo Takeuchi
DOI:10.1016/j.tetlet.2004.07.002
日期:2004.8
Ir(cod)Cl](2)/dppe-catalyzed allylic alkylation of 1,1-disubstituted-2,3-butadienyl acetates gives a product bearing a quaternary carbon center alpha to allene in high yield, (C) 2004 Elsevier Ltd. All rights reserved.
Gold(I)-Catalyzed Isomerization of Allenyl Carbinol Esters: An Efficient Access to Functionalized 1,3-Butadien-2-ol Esters
作者:Andrea K. Buzas、Florin M. Istrate、Fabien Gagosz
DOI:10.1021/ol063031t
日期:2007.3.1
A study concerning the gold(I)-catalyzed rearrangement of diversely substituted allenyl carbinol esters into functionalized 1,3-butadien-2-ol esters is described. The mild conditions employed allow the efficient, rapid, and stereoselective synthesis of a variety of such compounds via a new 1,3-shift of an ester moiety onto a gold-activated allene. [structure: see text]