Ring forming reactions of imines of 2-aminobenzaldehyde and related compounds
作者:Per Wiklund、Jan Bergman
DOI:10.1039/b209505j
日期:2003.1.13
By addition of organometallic reagents to 2-aminobenzonitriles followed by quenching with suitable electrophiles (acyl halides, aldehydes and ketones), several types of 6-membered benzofused aromatic and non-aromatic nitrogen heterocycles could be obtained. Rearrangements leading to 1,2-dihydro-3H-1,4-benzodiazepin-3-ones and preparation of various quinazolines are described.
The invention relates to a compound represented by the general formula (1),
1
where R
1
is an alkyl group or trialkylsilyl group; R
2
is an alkyl group, or a combination of R
2
and R
3
or R
4
forms an alkylene group; each of R
3
and R
4
is a hydrogen or a portion of the alkylene group; and A
−
is an anion. This compound (an ionic liquid) is useful as a catalyst and/or a reaction solvent in organic syntheses.