Synthesis of 5-substituted 4-aminoalkylpyrazol-3-ones (isoxazol-3-ones) from 3-acyllactams
作者:V. G. Nenajdenko、E. P. Zakurdaev、A. M. Gololobov、E. S. Balenkova
DOI:10.1007/s11172-005-0240-5
日期:2005.1
Structurally various 3-acyllactams act as 1,3-bielectrophiles in heterocyclization reactions with a variety of hydrazines and hydroxylamines to give aminoalkylpyrazolones and -isoxazol-ones in high yields.
Synthesis and the keto-enol equilibrium of 2-acyl lactams
作者:V. G. Nenajdenko、A. M. Gololobov、E. P. Zakurdaev、E. S. Balenkova
DOI:10.1023/b:rucb.0000012373.06094.ff
日期:2003.11
Condensation of N-substituted lactams with carboxylic acid esters was studied. A wide range of substituted 2-acyl lactams with different ring sizes were synthesized. The structure of 2-acyl lactams (primarily, the ring size) was found to influence the keto-enol tautomerism.
A new strategy for 2-substituted indolylalkylamines: synthesis of 2-aryldihomotryptamines
作者:Valentine G Nenajdenko、Eugene P Zakurdaev、Elizabeth S Balenkova
DOI:10.1016/s0040-4039(02)02105-6
日期:2002.11
Substituted homologues of tryptamines were synthesized in one step in high yields under mild conditions. The key intermediates are arylhydrazones of 6-aminohexanones, which undergo Fischer rearrangement readily in glacial acetic acid. An easy and ready for scale-up procedure is developed and formerly unknown 2-substituted dihomotryptamines are obtained.