Rhodium-catalyzed enantioselective alkynylative cyclization of allenyl aldehydes with terminal alkynes
摘要:
Asymmetric addition of terminal alkynes to allenyl aldehydes took place in the presence of an acetylacetonate complex [Rh(acac)L*] (L* = binap or segphos) as a catalyst to give indanol derivatives in high yields with high regio- and enantioselectivity. The acetylacetonate (acac) ligand on the rhodium is important for the selective formation of the indanol derivatives. (C) 2010 Elsevier Ltd. All rights reserved.
Rhodium-catalyzed enantioselective alkynylative cyclization of allenyl aldehydes with terminal alkynes
摘要:
Asymmetric addition of terminal alkynes to allenyl aldehydes took place in the presence of an acetylacetonate complex [Rh(acac)L*] (L* = binap or segphos) as a catalyst to give indanol derivatives in high yields with high regio- and enantioselectivity. The acetylacetonate (acac) ligand on the rhodium is important for the selective formation of the indanol derivatives. (C) 2010 Elsevier Ltd. All rights reserved.
Enantioselective Intermolecular [2 + 2 + 2] Cycloadditions of Ene–Allenes with Allenoates
作者:Andrew T. Brusoe、Rahul V. Edwankar、Erik J. Alexanian
DOI:10.1021/ol303024q
日期:2012.12.7
An enantioselective [2 + 2 + 2] cycloaddition of ene-allenes with allenoates is described, which transforms simple pi-components into stereochemically complex carbocycles in a single step. The rhodium(I)-catalyzed cycloaddition proceeds with good levels of enantioselectivity, and with high levels of regio-, chemo-, and diastereoselectivity. Our results are consistent with a mechanism involving an enantioselective intermolecular allene-allene oxidative coupling.
Rhodium-catalyzed enantioselective alkynylative cyclization of allenyl aldehydes with terminal alkynes
Asymmetric addition of terminal alkynes to allenyl aldehydes took place in the presence of an acetylacetonate complex [Rh(acac)L*] (L* = binap or segphos) as a catalyst to give indanol derivatives in high yields with high regio- and enantioselectivity. The acetylacetonate (acac) ligand on the rhodium is important for the selective formation of the indanol derivatives. (C) 2010 Elsevier Ltd. All rights reserved.