Using the Horner-Wittig reaction, aldehydes I and II were converted, with high E-selectivity, into ethyl esters of substituted acrylic acids, VI and VII. The N-anions generated by deprotonation of derivative I-V with sodium hydride in tetrahydrofuran reacted with vinyltriphenylphosphonium bromide with the formation of derivatives of pyrrolo[1,2-a]ergoline-I, XI-XV.
使用Horner-Wittig反应,醛类化合物I和II被高选择性地转化为取代
丙烯酸乙酯VI和VII。通过在
四氢呋喃中用氢化
钠脱质子化衍
生物I-V生成的N-阴离子,与
三苯基膦溴代
乙烯反应,形成
吡咯并[1,2-a] 艾果林-I衍
生物XI-XV。