Synthesis of Chromans via [3 + 3] Cyclocoupling of Phenols with Allylic Alcohols Using a Mo/o-Chloranil Catalyst System
摘要:
The combination of a molybdenum complex (CpMoCl(CO)(3) or [CpMo(CO)(3)](2)) and o-chloranil was used as a catalyst in the [3 + 3] cyclocoupling of phenols and allylic alcohols under microwave heating conditions. Substituted chromans were selectively obtained in moderate to good isolated yields.
Clay catalyzed rearrangement of substituted allyl phenyl ethers: Synthesis of ortho-allyl phenols, chromans and coumarans
作者:William G. Dauben、Jeffrey M. Cogen、Victor Behar
DOI:10.1016/s0040-4039(00)89033-4
日期:1990.1
Montmorillonite clays catalyze the rearrangement of substituted allyl phenyl ethers to provide ortho-allyl phenols, chromans and coumarans under mild conditions.
蒙脱土粘土在温和的条件下催化取代的烯丙基苯基醚的重排,以提供邻烯丙基苯酚,苯并二氢吡喃和香豆兰。
InIII-Catalysed Tandem C-C and C-O Bond Formation between Phenols and Allylic Acetates
Indium triflate catalysed tandem allylation–intramolecular hydroalkoxylation was efficiently carried out by using 1 mol-% of the catalyst under mild conditions to afford the dihydrobenzopyran ring system (chroman-type structure) in good yields. Kinetic, mechanistic and theoretical studies are also presented.
Alicyclic ketone and alcohol derivatives having the structure:
wherein the dotted line represents a carbon-carbon double bond or a carbon-carbon single bond; wherein Z is
and wherein each of R1, R2, R3, R4, and R, is hydrogen or lower alkyl are useful as odor-modifying ingredients in perfumes and perfumed products and as flavor-modifying ingredients in foodstuffs and tobacco products. These derivatives may be prepared from substituted phenols having the structure:
具有以下结构的脂环酮类和醇类衍生物: 其中虚线代表碳碳双键或碳碳单键; 其中 Z 为; 其中 R1、R2、R3、R4 和 R 为氢或低级烷基。 这些衍生物可由具有以下结构的取代苯酚制备而成: