Catalyst-free construction of spiro [benzoquinolizidine-chromanones] <i>via</i> a tandem condensation/1,5-hydride transfer/cyclization process
作者:Siyuan Liu、Hang Wang、Baomin Wang
DOI:10.1039/d0ob01887b
日期:——
A highly efficient and quite mild protocol to achieve spiro [benzoquinoline-chromanones] through a catalyst-free condensation/[1,5]-hydride shift/6-endo cyclization sequence was developed.
An N‐heterocyclic carbene catalyzed photooxidation reaction via intramolecular cross dehydrogenative coupling of tetrahydroisoquinoline‐tethered aldehydes was developed, giving the corresponding oxidative cyclization products in moderate to good yields. This reaction features mild conditions with oxygen as the terminal oxidant in the absence of photocatalyst.