Easy selective generation of (lithiomethyl)cyclopropane or homoallyllithium by a chlorine–lithium exchange
作者:Isidro M. Pastor、Itziar Peñafiel、Miguel Yus
DOI:10.1016/j.tetlet.2008.09.100
日期:2008.11
The reaction of (chloromethyl)cyclopropane 5 with lithium and a catalytic amount of DTBB (5 mol %) in the presence of different carbonyl compounds [Et2CO, n-Pr2CO, (c-C3H5)2CO, (CH2)5CO, PhCOMe, t-BuCHO, i-PrCHO, PhCHO] as electrophiles in THF at −78 °C leads, after hydrolysis with water, to the corresponding cyclopropyl alcohols 6. However, when the same starting material is lithiated using naphthalene
(氯甲基)环丙烷5与锂和催化量的DTBB(5 mol%)在不同羰基化合物[Et 2 CO,n -Pr 2 CO,(c -C 3 H 5)2 CO, (CH 2)5 CO,PhCOMe,t -BuCHO,i -PrCHO,PhCHO]在THF中在-78°C下亲电子体,在用水水解后导致相应的环丙醇6。然而,当使用萘作为芳烃催化剂在0℃下将相同的起始原料锂化,然后与相同系列的亲电试剂反应时,最终用水水解产生相应的不饱和醇7。