Synthesis of Substituted 1,6-Dioxaspiro[3.4]octanes from 3-Chloro-2-(chloromethyl)prop-1-ene
作者:Francisco Alonso、Larry R. Falvello、Phillip E. Fanwick、Emilio Lorenzo、Miguel Yus
DOI:10.1055/s-2000-6289
日期:——
The naphthalene-catalysed lithiation of 3-chloro-2-(chloromethyl)prop-1-ene, in the presence of symmetrically substituted ketones, led to the corresponding methylenic homoallylic diols, which upon treatment with iodine and silver(I) oxide in dioxane/water furnished a series of 1,6-dioxaspiro[3.4]octanes. These compounds are structural units present in some natural compounds such as clementeins and subexpinnatins.
New Trimethylenemethane Dianion Synthons: Application to the Preparation of Substituted Perhydrofuro[2,3-b]furans
作者:Emilio Lorenzo、Francisco Alonso、Miguel Yus
DOI:10.1016/s0040-4020(00)00060-0
日期:2000.3
The reaction of 3-chloro-2-(chloromethyl)prop-1-ene (1) with lithium powder and a catalytic amount of naphthalene in the presence of different electrophiles in THF at −78°C yields products 2. When carbonylic compounds are used as electrophiles the corresponding methylenic diols are obtained, which by tandem hydroboration–oxidation with alkaline hydrogen peroxide and treatment with PCC (for ketone derivatives)