Synthesis and Olfactory Properties of a 6′-Silasubstituted “Spiro[4.5]-δ-Damascone”
作者:Martin A. Lovchik、Philip Kraft
DOI:10.1002/chem.201605378
日期:2017.4.3
spirocyclic δ‐damascone odorant 6 was synthesized from allyltrichlorosilane (15) and but‐2‐en‐1‐ol (16). The latter was transformed to 3‐methylpen‐4‐enenitrile (11) by Saucy–Marbet reaction with ethoxyethane and subsequent treatment with HONH2⋅HCl. The resulting γ,δ‐unsaturated nitrile 11 was silylated with 1‐allyl‐1‐chlorosilolane (14), which was prepared from allyltrichlorosilane (15) and the bis‐Grignard
有效的螺环δ-大马士革加味剂6的硅类似物是由烯丙基三氯硅烷(15)和丁-2-烯-1-醇(16)合成的。将后者转化为3- methylpen -4-烯腈(11)通过与乙氧基乙烷和与HONH后续处理莽撞-Marbet反应2 ⋅ HCl中。生成的γ,δ-不饱和腈11被1-烯丙基-1-氯硅氧烷(14)甲硅烷基化,后者是由烯丙基三氯硅烷制备的(15)和1,4-二氯丁烷的双格氏试剂。使用Grubbs I催化剂进行易位的闭环反应,然后通过非水后处理进行DIBAL还原,与Pro-1-烯-1-基溴化镁的Grignard反应和Attenburrow MnO 2氧化反应完成了合成。发现目标化合物与螺[4.5]-δ-大马士革铅嗅觉相关,但弱约900倍。然而,在一种烯醇式布鲁克重排中,它会热分解为3,6-dihydro-2 H -1,2-氧杂嘧啶(20),这也是令人惊奇的大马士革香精。虽然,弱了12 000倍。