A GaCl3-Catalyzed [4+1] Cycloaddition of α,β-Unsaturated Carbonyl Compounds and Isocyanides Leading to Unsaturated γ-Lactone Derivatives
摘要:
A GaCl3-catalyzed reaction of alpha,beta-unsaturated ketones with isocyanides leading to the formation of unsaturated lactone derivatives is described. This is the first example of the catalytic [4+1] cycloaddition of alpha,beta-unsaturated ketones and isocyanides. GaCl3 is an excellent catalyst due to its lower oxophilicity, which is desirable for all of the key steps, such as E/Z isomerization, cyclization, and deattachment from the products.
Enantioselective Photocatalytic [3 + 2] Cycloadditions of Aryl Cyclopropyl Ketones
作者:Adrian G. Amador、Evan M. Sherbrook、Tehshik P. Yoon
DOI:10.1021/jacs.6b01728
日期:2016.4.13
Control of stereochemistry in photocycloaddition reactions remains a substantial challenge; almost all successful catalytic examples to date have involved [2 + 2] photocycloadditions of enones. We report a method for the asymmetric [3 + 2] photocycloaddition of aryl cyclopropyl ketones that enables the enantiocontrolled construction of densely substituted cyclopentane structures not synthetically accessible
Platinum-Catalyzed Addition of Dimethylsilylene to β-Methyl α,β-Unsaturated Ketones: γ-Silylation Forming 1-Oxa-2-silacyclohex-5-enes
作者:Kazuhiro Okamoto、Tamio Hayashi
DOI:10.1021/ol702357n
日期:2007.11.1
The reaction of beta-methyl alpha,beta-unsaturated ketones with pentamethyldisi lane in the presence of a platinum catalyst brought about silylation on the beta-methyl group giving high yields of oxasilacyclohexenes.
A GaCl<sub>3</sub>-Catalyzed [4+1] Cycloaddition of α,β-Unsaturated Carbonyl Compounds and Isocyanides Leading to Unsaturated γ-Lactone Derivatives
A GaCl3-catalyzed reaction of alpha,beta-unsaturated ketones with isocyanides leading to the formation of unsaturated lactone derivatives is described. This is the first example of the catalytic [4+1] cycloaddition of alpha,beta-unsaturated ketones and isocyanides. GaCl3 is an excellent catalyst due to its lower oxophilicity, which is desirable for all of the key steps, such as E/Z isomerization, cyclization, and deattachment from the products.