Upon treatment with various organolithiums, 4-acetoxyazetidin-2-one (10) afforded the corresponding carbondisplaced compounds (11), (12), and (13). 4-(3-Diazo-3-ethoxycarbonyl-2-oxopropyl)azetidin-2-one (15) was also synthesised from (10) and ethyl α-diazoacetoacetate in the presence of lithium hexamethyldisilazide in one step. The diazo-compound (15) was thermally cyclised to the bicyclic keto-ester
用各种
有机锂处理后,4-乙酰氧基氮杂
环丁烷-2-酮(10)得到相应的碳置换的化合物(11),(12)和(13)。在六甲基二
硅叠氮化
锂存在下,由(10)和α-重氮
乙酰乙酸乙酯也合成了4-(3-重氮-3-乙氧基羰基-2-氧丙基)氮杂
环丁烷-2-酮(15)。在
乙酸铑的存在下,将重氮化合物(15)热环化成双环
酮酯(17)。