Treatment of cis- and trans-10-hydroxy-N-methyl-decahydroisoquinoline, (3a) and (10a) respectively, or N-methyl-Δ9,10-octahydroisoquinoline (4 a) with hydrogen chloride in acetic acid affords the thermodynamically more stable trans-isomer of 10-chloro-N-methyl-decahydroisoquinoline (1a). On the other hand ring closure of β-(cyclohexen-1-yl)-ethylamines 11a or 11b with aqueous formaldehyde in the presence
的治疗顺式-和反式-10-羟基-N-甲基-十氢异喹,(3A)和(10A分别地),或N-甲基- Δ 9,10 -octahydroisoquinoline(4)用在
乙酸得到
氯化氢热力学10-
氯-N-甲基-
十氢异喹啉(1a)的更稳定的反式异构体。另一方面,在
氯离子存在下用含
水甲醛将β-(
环己烯-1-基)-
乙胺11a或11b闭环,从而在动力学控制的反应中生成10-顺式
氯化物2a或2b。