The behavior of 2-naphthol and 7-bromo-2-naphthol as organic photoacids are exploited in organic synthesis for the preparation of benzyl sulfides (using a trichloroacetimidate derivative as the starting substrate) and polycyclic amines via acid catalyzed condensation of 1,2,3,4-tetrahydroisoquinoline with aldehydes.
The firstasymmetric intramolecular Stetter reaction is reported, using the chiral triazolium salt 1 as catalyst. Starting from the easily accessible 4-(2-formylphenoxy)but-2-enoates 2, this protocol opens up an enantioselective pathway to the benzo-annulated pyran-4-ones (chroman-4-ones) 3a–h with good yields and enantiomeric excesses of up to 74%.
Remarkable Differences in Reactivity between Cyanide and N‐Heterocyclic Carbene
<scp>s</scp>
in
<scp>Ring‐Closing</scp>
Reactions of 4‐(
<scp>2‐Formylphenoxy</scp>
)but‐2‐Enoate Derivatives
作者:Eunjoon Park、Jina Park、Cheol‐Hong Cheon
DOI:10.1002/bkcs.12146
日期:2021.3
A different reactivity between cyanide and NHC with 4‐(2‐formylphenoxy) but‐2‐enoate derivatives is described.
描述了氰化物和NHC与4-(2-甲酰基苯氧基)但是2-烯酸酯衍生物之间的不同反应性。
An Efficient Intramolecular Stetter Reaction in Room Temperature Ionic Liquids Promoted By Microwave Irradiation
作者:Zhong-Zhen Zhou、Feng-Qing Ji、Min Cao、Guang-Fu Yang
DOI:10.1002/adsc.200606156
日期:2006.9
communication describes the first report of a microwave-assisted intramolecular Stetter reaction using imidazolium-type roomtemperatureionic liquids (RTILs) as solvents, with thiazolium salts and Et3N as catalysts. The features such as good to excellent yields, shorter reaction time (5–20 min), and recyclable and reusable ionic liquid and catalyst make this method an environmentally benign and highly efficient