The first methodology to prepare indolizidine systems directly from β-lactams has been developed. This process involves the amide bond cleavage of the β-lactam ring in the aza Diels-Alder cycloadducts with concomitant cyclization. Indolizidinone precursors arise from normal, as well as inverse electron-demand condensation involving the C=N moiety of 2-azetidinone-tethered imines as the dienophile or the heterodiene contributor.
已经开发出将β-内酯系统直接转化为
吲哚啉体系的首个方法。这一过程涉及到在氮杂Diels-Alder环加成物中对β-内酯环的酰胺键裂解,同时伴随环化反应。
吲哚啉酮前体的形成源自正常以及逆电子需求的缩合反应,其中2-噁烷酮连接的
亚胺的C=N部分作为亲二烯或异二烯的贡献者。