Acylimine mediated N N bond cleavage of pyrazolidinediones and subsequent conversion to dihydropyrimidinediones and malonamides
摘要:
Acylimines 3 were identified as intermediates in the fluorenyl assisted N-N bond cleavage of pyrazolidinediones 1. Subsequent conversion of 3 to dihydropyrimidinediones 4 and malonamides 7-10 is described. (C) 2000 Published by Elsevier Science Ltd.
The title compound C21H22N2O2, was synthesized from the corresponding pyrazolidinedione precursor by 9-fluorenyl substitution and subsequent ring expansion. The hexahydropyrimidinedione (HHPD) ring has a very flattened chair conformation and is nearly perpendicular [88.79(13)degrees] to the 2-spiro-9'-fluorene ring. The two ethyl groups adopt a folded conformation and lie on opposite sides of the HHPD ring. A hydrogen-bonding scheme consisting of N-H ... O=C and C-H ... O=C interactions produces parallel molecular layers.
STEIGEL A., CHEM. BER., 1980, 113, NO 12, 3915-3918
作者:STEIGEL A.
DOI:——
日期:——
STEIGEL A.; FEY R., CHEM. BER., 1980, 113, NO 12, 3910-3914