Bromination of the furanoquinoline alkaloid haplophyllidine by molecular bromine and N-bromosuccinimide was accompanied by intramolecular cyclization to form mixtures of new compounds containing additional penta-, hexa-, and spirocyclic rings incorporating the prenyl group of haplophyllidine. The structures and absolute configurations of the chiral centers of all four bromo-derivatives were elucidated using a combination of NMR spectroscopic methods and X-ray crystal structure analyses.
通过分子
溴和N-
溴代琥珀
酰亚胺对
呋喃喹啉生物碱单叶草碱进行
溴化,伴随分子内环化反应,形成含有额外五元环、六元环和螺环的新化合物混合物,其中结合了单叶草碱的异
戊烯基。通过结合使用核磁共振光谱法和X射线晶体结构分析,阐明了所有四种
溴衍
生物的手性中心的结构和绝对构型。