The lysergic acid analogue
1-methyl-1,2,3,7,8,9-hexahydro-5,6-benzquinoline (III ; R=H) was prepared from
2-bromo-α-tetralone by two parallel routes. The first, a seven-stage
sequence, involved conversion of the starting material into 2-[N-methyl-N- (2'-oxo-n-propyl)]-amino-α-tetralone
(IX) via its ethylene ketal, followed by ring closure to the tricyclic
1-methyl-3-oxo-1,2,3,7,8,9-hexahydro-5,6-benzquinoline (V). This was
transformed into its ethylene dithioketal (XXIX) and thence by desulphurization
into (III: R=H).
The second pathway, a five-step synthesis,
utilized dimethylaminoacetone to obtain directly the quaternary diketone (XXI),
which was cyclized to 1,1-dimethyl-3-oxo-1,2,3,7,8,9-hexahydro-5,6-benzquinolinium
bromide (XXV), identical with that obtained by the alternative route.
麦角酸类似物
1-甲基-1,2,3,7,8,9-六氢-5,6-苯并
喹啉(III;R=H)是由 2-
溴-α-四氢
萘酮通过两条平行路线制备而成的。
2-
溴-α-四氢
萘酮通过两条平行路线制备。第一种是七步
将起始原料转化为 2-[N-甲基-N-(2'-氧代-N-丙基)]-
氨基-α-四氢
萘酮(IX
(IX),然后通过其
乙烯缩酮闭环生成
三环化合物
1-methyl-3-oxo-1,2,3,7,8,9-hexahydro-5,6-benzquinoline (V).将其
转化为
乙烯二
硫酮 (XXIX),然后通过脱
硫转化为
成(III:R=H)。
第二条途径是五步合成法、
利用二甲基
氨基
丙酮直接得到季二酮 (XXI)、
环化成
1,1-二甲基-3-氧代-1,2,3,7,8,9-六氢-5,6-苯并
喹啉鎓
溴化物 (XXV)。
溴化物 (XXV),与另一种方法得到的结果相同。