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.