Synthesis and Transannular Diels-Alder Reaction of a 13-Membered Macrocyclic Triene. A Synthetic Approach Towards the Tricyclic Part A.B.C.[6.6.5] of the Veratrum Alkaloids
作者:Miguel Quimpère、Luc Ruest、Pierre Deslongchamps
DOI:10.1055/s-1992-34151
日期:——
The syntheses of the acyclic triene cis-trans-trans (3Z, 9Z,11E)-13-chloro-3-methoxy-1,1,7,7-tetrakis(methoxycarbonyl) -4-methyltrideca-3,9,11-triene (25), and the corresponding trans-cis-trans (3Z,9E,11E) isomer 37, and trans-trans-trans (3Z,9E,11E) isomer, 46, are described. Compounds 25 and 37 furnished in good yield 13-membered macrocyclic compounds (3Z,9Z, 11E)- and (3Z,9E,11Z)-3-methoxy-1, 1,7,7-tetrakis(methoxycarbonyl)-4-methylcyclotrideca-3,9,11-triene (26) and (38) which led to tricyclic compound (cis-anti-cis)-2-methoxy-4,4, 11,11-tetrakis(methoxycarbonyl)-1-methyltricyclo[7.4.0.0.2,6]tridec-7-ene (27) by transannular Diels-Alder reaction. Macrocyclization of trans-trans-trans chloride 46 was not successful.
合成了非环状三烯 cis-trans-trans(3Z, 9Z, 11E)-13-氯-3-甲氧基-1,1,7,7-四酯(甲氧基羧酸酯)-4-甲基三十三烯(25)及相应的 trans-cis-trans(3Z, 9E, 11E)异构体 37,以及 trans-trans-trans(3Z, 9E, 11E)异构体 46。化合物 25 和 37 产率良好地产生了 13 元大环化合物(3Z, 9Z, 11E)和(3Z, 9E, 11Z)-3-甲氧基-1, 1, 7, 7-四酯(甲氧基羧酸酯)-4-甲基环三十三烯(26)和(38),进一步通过环间 Diels-Alder 反应生成三环化合物(顺-反-顺)-2-甲氧基-4, 4, 11, 11-四酯(甲氧基羧酸酯)-1-甲基三环[7.4.0.0.2,6]三十三烯(27)。对应的 trans-trans-trans 氯化物 46 的大环化反应未能成功。