A practical synthesis of a key intermediate for the production of β-lactam antibiotics
作者:Gianfranco Cainelli、Paola Galletti、Daria Giacomini
DOI:10.1016/s0040-4039(98)01700-6
日期:1998.10
exahydro-1,3,5-triazine in presence of a Lewis acid and (R)-3-(t-butyldimethylsilyloxy)butyric acid chloride with Et3N directly furnish (3S,1′R)-N-p-methoxyphenyl-3-(1-t-butyldimethylsilyloxy)ethylazetidin-2-one with good diastereo-selectivity. This product is transformed into the 4-acetoxy-azetidinone 1, a key intermediate in the synthesis of β-lactam antibiotics.
N-(对甲氧基苯基)-六氢-1,3,5-三嗪在路易斯酸和(R)-3-(叔丁基二甲基甲硅烷氧基)丁酰氯与Et 3 N的存在下直接提供(3 S,1' [R )- ñ - p -甲氧基苯基-3-(1-吨-butyldimethylsilyloxy)乙基氮杂-2-酮与良好非对映选择性。该产物被转化为4-乙酰氧基-氮杂环丁酮1,这是合成β-内酰胺类抗生素的关键中间体。