Synthesis and bioactivity of fused- and spiro-β-lactone-lactam systems
作者:Laia Josa-Culleré、Christopher Towers、Frances Willenbrock、Valentine M. Macaulay、Kirsten E. Christensen、Mark G. Moloney
DOI:10.1039/c7ob01148b
日期:——
Fused systems are formed preferentially, under standard conditions, but spiro systems are accessible only when the formation of the fused system is blocked and with careful optimisation of reaction conditions.
The synthesis of a lactam-lactone bicyclic system containing a pyroglutamate subunit proceeds to give the fused lactone system, which is favoured over the spirocyclic lactone alternative. These systems display no or weak antibacterial activity against the test organisms S. aureus and E. coli. heterocycles - natural products - cyclisation - antibiotics - lactams