1,3-Asymmetric induction by planar chiral (η4-diene)Fe(CO)3 complexes in Diels-Alder reaction
摘要:
The Diels-Alder reaction of 1,3-dienes with alpha,beta-unsaturated ketones adjacent to planar chiral (eta(4)-1,3-diene)Fe(CO)(3) complexes in the presence of Lewis acid proceeded diastereoselectively. The dienophiles reacted with cyclopentadiene to give the endo adducts stereoselectively. The Lewis acid affected remarkably the diastereoselectivity in the reaction.
Transformation of the carboxyl group adjacent to the (η4-diene)Fe(CO)3 moiety: a convenient route to (η4-diene)Fe(CO)3 complexes containing α,β- and β,γ-unsaturated carbonyl groups, and 1,3-dicarbonyl groups
摘要:
Acyl halides adjacent to an (eta(4)-diene)Fe(CO), moiety react with allylsilanes, vinylsilanes and enamines to give the corresponding allyl ketones, vinyl ketones and 1,3-diketones in high yields, respectively. The allylation reaction proceeds smoothly under neutral conditions without a Lewis acid as an activating agent, while the vinylation reaction takes place in the presence of a Lewis acid. (C) 1999 Elsevier Science S.A. All rights reserved.
Transformation of the carboxyl group adjacent to the (η4-diene)Fe(CO)3 moiety: a convenient route to (η4-diene)Fe(CO)3 complexes containing α,β- and β,γ-unsaturated carbonyl groups, and 1,3-dicarbonyl groups
Acyl halides adjacent to an (eta(4)-diene)Fe(CO), moiety react with allylsilanes, vinylsilanes and enamines to give the corresponding allyl ketones, vinyl ketones and 1,3-diketones in high yields, respectively. The allylation reaction proceeds smoothly under neutral conditions without a Lewis acid as an activating agent, while the vinylation reaction takes place in the presence of a Lewis acid. (C) 1999 Elsevier Science S.A. All rights reserved.
1,3-Asymmetric induction by planar chiral (η4-diene)Fe(CO)3 complexes in Diels-Alder reaction
The Diels-Alder reaction of 1,3-dienes with alpha,beta-unsaturated ketones adjacent to planar chiral (eta(4)-1,3-diene)Fe(CO)(3) complexes in the presence of Lewis acid proceeded diastereoselectively. The dienophiles reacted with cyclopentadiene to give the endo adducts stereoselectively. The Lewis acid affected remarkably the diastereoselectivity in the reaction.