Synthesis of 10-methyl-Δ<sup>4</sup>-octalins by Diels–Alder reactions of 2<i>H</i>-thiopyran surrogates for 1-ethenyl-2-methylcyclohexene
作者:Dale E. Ward、Yuanzhu Gai
DOI:10.1139/v97-082
日期:1997.6.1
surrogates for 1-ethenyl-2-methylcyclohexene is investigated. The desired Diels–Alder adducts were not obtained by reaction of 6,7,8,8a-tetrahydro-5,5-dimethyl-3-tris(1-methylethyl)silyloxy-1H-2-benzothiopyran (7c) or 1,5,7,8-tetrahydrospiro[6H-2-benzothiopyran-6,2′-[1,3]dioxolane] (17) with N-phenylmaleimide. Reactions of 3-[2-(2-methyl-1,3-dioxolan-2-yl)ethyl]-4-[(tris(1-methylethyl)silyl)oxy]-2H-thiopyran
1-乙烯基-2-甲基环己烯衍生物的狄尔斯-阿尔德反应可能是获得具有10-甲基萘烷亚结构并在C-8和C-9处有额外取代的各种天然产物骨架的通用途径。这些二烯是非反应性的(部分原因是)乙烯基甲基的存在,这破坏了必要的 s-cis 构象。研究了 2H-噻喃二烯替代物用于 1-乙烯基-2-甲基环己烯的用途。通过 6,7,8,8a-四氢-5,5-二甲基-3-三(1-甲基乙基)甲硅烷氧基-1H-2-苯并噻喃 (7c) 或 1,5 ,7,8-四氢螺[6H-2-benzothiopyran-6,2'-[1,3]dioxolane] (17) 与 N-苯基马来酰亚胺。3-[2-(2-甲基-1,3-二氧戊环-2-基)乙基]-4-[(三(1-甲基乙基)甲硅烷基)氧基]-2H-噻喃(19)与马来酰亚胺的反应,N -甲基马来酰亚胺,