Substitution reactions of 2-benzenesulphonyl cyclic ethers with carbon nucleophiles
作者:Dearg S. Brown、Maurizio Bruno、Raymond J. Davenport、Steven V. Ley
DOI:10.1016/s0040-4020(01)81323-5
日期:1989.1
Direct substitution of 2-benzenesulphonyl cyclic ethers was studied using a variety of carbon nucleophiles. These nucleophiles included organozinc reagents (derived from aryl, vinyl and alkynyl Grignard reagents) or silyl enolethers, silyl ketene acetals, allylsilanes and trimethylsilylcyanide in the presence of aluminum chloride. A general selectivity for the formation of the trans-product was observed
Stereoselective synthesis of side chain-functionalized tetrahydropyrans from 5-hexenols
作者:Patrick Fries、Melanie Kim Müller、Jens Hartung
DOI:10.1016/j.tet.2013.12.019
日期:2014.2
products of 6-exo-bromocyclization, as exemplified by synthesis of diastereomerically pure 2,4,6-substituted tetrahydropyrans. The cobalt method extends to intermolecular alkene/alkanol cross-coupling and to multi-component reactions between dimethyl fumarate, CHD, a 5-hexenol, and dioxygen, providing α-tetrahydropyranyl-2-methyl succinates in synthetically useful yields.
A Convenient Synthesis of Cyclic Ethers from Siloxy Carbonyl Compounds
作者:Koichi Homma、Teruaki Mukaiyama
DOI:10.1246/cl.1989.259
日期:1989.2
Five–seven membered cyclic ethers are prepared by one-pot procedure in good yields from γ-, δ-, and e-siloxy carbonyl compounds, respectively, on treatment with silyl nucleophiles (triethylsilane, allyltrimethylsilane, trimethylsilyl cyanide, etc.) in the presence of a catalytic amount of trityl hexachloroantimonate, or a catalyst system of antimony pentachloride, chlorotrimethylsilane and tin (II)
分别用甲硅烷基亲核试剂(三乙基硅烷、烯丙基三甲基硅烷、三甲基氰化氰化物等)处理后,分别由γ-、δ-和ε-甲硅烷氧基羰基化合物以高产率通过一锅法制备五七元环醚。存在催化量的六氯锑酸三苯甲基酯,或五氯化锑、氯三甲基硅烷和碘化锡 (II) 的催化剂体系。
Brown, Dearg S.; Ley, Steven V.; Bruno, Maurizio, Heterocycles, 1989, vol. 28, # 2, p. 773 - 777