Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 14, Issue -, Pages 2510-2519Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.14.227
Keywords
cyclodehydrations; dihydroquinazolines; microwaves; nitrilium ions; PPSE; SNAr
Categories
Funding
- Universidad de Buenos Aires [20020130100466]
Ask authors/readers for more resources
The sequential N-functionalization of 2-aminobenzylamine (2-ABA) followed by cyclodehydration allowed for a straightforward and efficient synthesis of 3,4-dihydroquinazolines with N-aryl substituents bearing electron-withdrawing groups. The sequence involves an initial SNAr displacement, N-acylation and MW-assisted ring closure. Remarkably, the uncatalyzed N-arylation of 2-ABA led to the monosubstitution product using equimolar amounts of both reagents. The individual steps were optimized achieving good to excellent overall yields of the desired heterocycles, avoiding additional protection and deprotection steps. A mechanistic interpretation for the cyclodehydration reaction promoted by trimethylsilyl polyphosphate (PPSE) is also proposed on the basis of literature data and our experimental observations.
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