Attempted spirocyclisation of tricarbonyldimethyl[3-(4-methoxycyclohexa-2,4-dienylium)propyl]malonate}iron hexafluorophosphate (4) and tricarbonyl[methyl 5-(4-methoxycyclohexa-2,4-dieny)ium-3-oxopentanoate]iron hexafluorophosphate (11) to the desired spiro[4.5]decane derivatives (5) and (12) failed under a variety of mild conditions. Spirocyclisation of tricarbonyl[methyl 6-(4-methoxycyclohexa-2,
尝试将三羰基二甲基[3- [4-(4-甲氧基环己二,4-二烯基鎓),丙基]
丙二酸]
铁六氟磷酸酯(4)和三羰基[甲基5-(4-甲氧基环己-2,4-二烯基)-3-)螺环化在多种温和条件下,氧杂
戊酸铁六氟磷酸盐(11)生成所需的
螺[4.5]癸烷衍
生物(5)和(12)失败。三羰基[甲基6-(4-甲氧基环己-2,4-二烯基鎓)-3-氧代
己酸酯]
铁六氟磷酸酯的螺旋环化反应在–78°迅速平稳地发生,从而得到三羰基[η-7–10-(甲基9] -甲氧基-2-氧代螺氧基[5.5] undeca-7,9-二烯-1-
羧酸酯]
铁非对映异构体(26)和(27)。