The efficient synthetic procedures to dl-β-costol (1a), dl-arctiol (2), and the related eudesmane type sesquiterpenes are described. trans-8,8-Ethylenedioxy-4aβ-methyldecalin-2α-ol (6a), prepared from trans-1,1-ethylenedioxy-4aβ-methyl-Δ6,7-octalin by epoxidation and subsequent reduction of the epoxy ring, was converted into 1a as follows: (1) deacetalization of 6a followed with mesylation, giving
描述了 dl-β-costol (1a)、dl-arctiol (2) 和相关eudesmane 型
倍半萜的有效合成程序。trans-8,8-Ethylenedioxy-4aβ-methyldecalin-2α-ol (6a),由 trans-1,1-ethylenedioxy-4aβ-methyl-Δ6,7-octalin 通过环氧化和随后的环氧环还原制备,被转化成 1a 如下:(1) 6a 脱
缩醛,然后甲磺酰化,得到 2α-甲基磺酰氧基-4aβ-甲基十氢
萘-8-酮 (7b),(2) 7b 与
钠丙二酸甲酯缩合,随后与亚甲基
三苯基膦进行 Wittig 反应,得到二甲基(反式) -4aβ-methyl-1-methylene-7β-decalinyl)malonate (9), (3) 用 NaAl(OCH2CH2OMe)2H2 还原 9 的钠盐。用
PCC 氧化 1a 得到 dl-β-costsd。dl-Arctiol