作者:P. A. van Elburg、D. N. Reinhoudt
DOI:10.1002/recl.19881070505
日期:——
cyclization of the corresponding oximes 5a-c and 14a-d. Oxidation of the 1-hydroxyazetidines 8a-c and 17 with PbO2 afforded the corresponding four-membered cyclic nitrones 18a-c and the bicyclic four-membered nitrones 18d and 18e, which were characterized as the cycloadducts 19a-c and 20 by reaction with dimethyl acetylenedicarboxylate. Pb(OAc)4 oxidation of the monocyclic l-hydroxy-azetidine 8a gave 1,4-bis(acetyloxy)
1-(苄氧基)氮杂环丁烷7a-c和16a,b是通过相应的肟5a-c和14a-d的还原环化反应合成的。1-羟基氮杂环丁烷8a-c和17用PbO 2氧化,得到相应的四元环硝酮18a-c和双环四元硝酮18d和18e,通过与环己酰胺反应,表征为环加合物19a-c和20。乙炔二羧酸二甲酯。单环1-羟基氮杂环丁烷8a的Pb(OAc)4氧化得到1,4-双(乙酰氧基)β-内酰胺22a和1,4,4-三(乙酰氧基)β-内酰胺23a,而1-羟基氮杂环丁烷8b,c的氧化仅得到1,4-双(乙酰氧基) β-内酰胺22b和22c。用Pb(OAc)4氧化双环1-羟基氮杂环丁烷17,得到双环双(乙酰氧基)β-内酰胺21。