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)
3-氯-2-(氯甲基)丙-1-烯(1)与锂粉和催化量的萘在不同亲电试剂存在下于-78°C在THF中反应,生成产物2。当将羰基化合物用作亲电子试剂时,会获得相应的亚甲基二醇,这是通过碱式过氧化氢的串联硼氢化-氧化并用PCC(对于酮衍生物)或(Ph 3 P)3 RuCl 2(对于醛衍生物)处理提供的。过氢呋喃呋喃3。使用2-氯甲基-3-(2-甲氧基乙氧基)丙-1-烯(4)作为原料,在上述条件下,选择性的氯/锂交换相对于烯丙基碳-氧键裂解使引入的第一个亲电试剂在-78至-30°C的温度下引入,第二个亲电试剂在-30°C的温度下引入室温下给予产品5。当应用于二醇5时,上述相同的氧化方案会导致不同取代的全氢呋喃呋喃7。