Repeated acylation of phloroglucinol followed by intermediate reduction gave 4-deoxytetrahydrohumulone (VI), which was, by procedures of known type, converted into a mixture of (±)-cis- and (±)-trans-tetrahydroisohumulones [racemates of (XIX) and (XX) respectively]. The isomers were separated by chromatography and differentiated by their u.v. and 220 MHz n.m.r. spectra.
将
间苯三酚重复酰化,然后进行中间还原,得到4-
脱氧四
氢hydro草
酮(VI),通过已知类型的方法将其转化为(±)-顺式-和(±)-反式-四
氢异hu草
酮[(XIX的外消旋物)的混合物和(XX)]。通过色谱分离异构体,并通过其uv和220
MHz nmr光谱进行区分。