Abstract
A protocol for the introduction of spiro[4.5] lactone straps
onto the Tröger’s base scaffold has been developed.
The conversion was found to be most efficient when an
appropriate carboxylic acid derivative reacted with 5,6,11,12-tetrahydrodibenzo[b ,f ][1,5]diazocines.
Whilst phthaloyl dichloride was the main strap-forming precursor
used, other 1,2-unsaturated dicarboxylic acids could be used in
the presence of N ,N ′-dicyclohexylcarbodiimide.
Key words
Tröger’s base - lactones - amines - cyclization - spiro compounds
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