作者:Stephen V. Attwood、Anthony G. M. Barrett、Jean-Claude Florent
DOI:10.1039/c39810000556
日期:——
2,4-Di(lithio-oxy)penta-1,3-diene and 2,4-di(lithio-oxy)-3-methylpenta-1,3-diene condensed with tetrahydropyran-2-one to give 2-methyl- and 2,3-dimethyl-1,7-dioxaspiro [5.5] undec-2-en-4-one; subsequent reduction gave the derived alcohols (LiAlH4) and 2,3-dimethyl-1,7-dioxaspiro [5.5]undec-3-ene (LiAlH4â AlCl3); the milbemycin β3 unit ethyl 2-acetyl-4-hydroxy-5-methylbenzoate was prepared from ethyl 2-(4-chlorophenylthio)-4-oxopent-2-enoate and (E)-1-methoxy-2-methyl-3-trimethylsilyloxy-buta-1,3-diene via a DielsâAlder reaction.
2,4-二(锂氧基)戊-1,3-二烯和2,4-二(锂氧基)-3-甲基戊-1,3-二烯与四氢吡喃-2-酮缩合,得到2-甲基和2,3-二甲基-1,7-二氧杂螺[5.5]十一烯-4-酮;后续还原(LiAlH4)得到衍生的醇类和2,3-二甲基-1,7-二氧杂螺[5.5]十一烯-3-烯(LiAlH4–AlCl3);米尔贝霉素β3单元乙基2-乙酰基-4-羟基-5-甲基苯甲酸酯是通过Diels–Alder反应由乙基2-(4-氯苯基硫)-4-氧戊-2-烯酸酯和(E)-1-甲氧基-2-甲基-3-三甲基硅氧基丁-1,3-二烯制备的。