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hexinhua0920
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3Â¥2009-09-27 09:49:58
hexinhua0920
ľ³æ (ÕýʽдÊÖ)
- Ó¦Öú: 32 (СѧÉú)
- ½ð±Ò: 4053.5
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¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
º£Èôqi(½ð±Ò+5,VIP+0):лл 9-27 20:05
472514568(½ð±Ò+2,VIP+0):½±Àø»ý¼«»ØÌû 9-28 14:47
º£Èôqi(½ð±Ò+5,VIP+0):лл 9-27 20:05
472514568(½ð±Ò+2,VIP+0):½±Àø»ý¼«»ØÌû 9-28 14:47
|
¡¾Ò©ÎïÃû³Æ¡¿Piperacillin »¯Ñ§½á¹¹Ê½(Chemical Structure): ²Î¿¼ÎÄÏ×No. 800605 ±êÌâ: Piperacillin ×÷Õß: Loren, J.G.; Castañer, J. À´Ô´: Drugs Fut 1978,3(11),829 ºÏ³É·Ïßͼ½â˵Ã÷: The cyclization of diethyl oxalate (I) with N-ethylethylenediamine (II) in ethanol gives ethyl-2,3-dioxopiperazine (III), which by reaction first with trimethylsilyl chloride and triethytamine and then with phosgene in THF is converted into 4-ethyl-2,3-dioxopiperazine-1-carboxylic acid chloride (IV). Finally, this compound is condensed with 6-D-(-)-alpha-aminophenylacetamidopenicillanic acid (V) by means of triethylamine in THF - water. ²Î¿¼ÎÄÏ×No. 800606 ±êÌâ: Penicillins and cephalosporins and process for producing the same ×÷Õß: Saikawa, I.; et al. À´Ô´: DE 2519400; FR 2269937; FR 2320295; GB 1508062 ºÏ³É·Ïßͼ½â˵Ã÷: The cyclization of diethyl oxalate (I) with N-ethylethylenediamine (II) in ethanol gives ethyl-2,3-dioxopiperazine (III), which by reaction first with trimethylsilyl chloride and triethytamine and then with phosgene in THF is converted into 4-ethyl-2,3-dioxopiperazine-1-carboxylic acid chloride (IV). Finally, this compound is condensed with 6-D-(-)-alpha-aminophenylacetamidopenicillanic acid (V) by means of triethylamine in THF - water. |
2Â¥2009-09-27 09:49:07
hexinhua0920
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4Â¥2009-09-27 10:20:19
º£Èôqi
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5Â¥2009-09-27 20:06:06














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