Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 20, Issue 48, Pages 9639-9644Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ob01764d
Keywords
-
Categories
Funding
- Tianjin Municipal Education Commission
- [2018KJ137]
Ask authors/readers for more resources
This study reveals the mechanism of the domino reaction of thioisatin with bromoacetophenone and tryptamine hydrochloride, and demonstrates the crucial role of the acid-base form of the amine partner in the selectivity.
The nucleophile-induced domino reaction is a featured reactivity mode of thioisatin, but the C2/C3 positional selectivity towards a nucleophile has not been understood in-depth. In this work, a domino reaction of thioisatin with bromoacetophenone and tryptamine hydrochloride to produce a benzothiophene-fused eight-membered N-heterocycle was described, showing that the Bronsted acid-base form of the amine partner was crucial for the selectivity, because using tryptamine instead of tryptamine hydrochloride gave a different product. Control experiments and density functional calculations revealed that the domino reaction using tryptamine or tryptamine hydrochloride was triggered by a condensation reaction at the C2 or C3 position of thioisatin, respectively. A delicate balance between local electrophilicity and polarization effect may be responsible for the observed selectivity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available