中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 3-acetoxy-1,4-dibenzyl-3-<1-(2-methoxyethyl)ethenyl>piperazine-2,5-dione | 81235-90-7 | C25H28N2O5 | 436.508 |
—— | N-benzyl-N-(2-benzylamino-2-oxoethyl)-3-(2-methoxyethyl)-2-oxo-3-butenamide | 81235-87-2 | C23H26N2O4 | 394.47 |
—— | 3-acetoxy-1,4-dibenzyl-3-(3-hydroxy-1-methylenepropyl)piperazine-2,5-dione | 81235-89-4 | C24H26N2O5 | 422.481 |
—— | 3-acetoxy-1,4-dibenzyl-3-<1-(2-(tetrahydropyran-2-yloxy)ethyl)ethenyl>piperazine-2,5-dione | 81236-03-5 | C29H34N2O6 | 506.599 |
—— | 6,9-dibenzyl-4-methyleneoxa-6,9-diazaspiro-<4,6>decane-7,10-dione | 81236-04-6 | C22H22N2O3 | 362.428 |
3-Acetoxy-1,4-dibenzyl-3-[1-(2-methoxyethyl)ethenyl]piperazine-2,5-dione (32) and its 2-hydroxyethyl analogue (46), which possess several of the structural features of the antibiotic bicyclomycin, have been synthesized by a route involving construction of the piperazine-2,5-dione ring at a late stage in the reaction sequence. Treatment of ethyl 3-(2-methoxyethyl)-3-methylglycidate with acetic anhydride and sulfuric acid gives ethyl 2-acetoxy-3-(2-methoxyethyl)-3-butenoate (10), which is converted to the corresponding carboxylic acid by ethanolysis, hydrolysis, and reacetylation. This, on conversion to its acid chloride and reaction with N,N′-dibenzylglycinamide, gives 2-acetoxy-N-benzyl-N-(2-benzylamino-2-oxocthyl)-3-(2methoxyethyl)-3-butenamide (21). Compound 21, on hydrolysis and oxidation, gives the corresponding 2-oxo compound, which on treatment with magnesium isopropylcyclohexylamide followed by acetylation yields 32. Demethylation of 21 with alkylthiotrimethylsilanes gives the corresponding 2-hydroxyethyl compound, whose tetrahydropyranyl ether on subjection to the above reaction sequence gives the 2-(tetrahydropyran-2-yloxy)ethyl analogue of 32. This, on hydrolysis, gives a 3: 1 mixture of compound 46 and a spiro compound formed by displacement of the acetoxyl group by the hydroxyl oxygen atom of 46.