Enantioselective [2,3]-Wittig Rearrangement via Sparteine-Mediated Lateral Metalation of N,N-Dialkyl-o-allyloxymethylbenzamides and o-Substituted Benzyl Prenyl Ethers
Enantioselective [2,3]-Wittig Rearrangement via Sparteine-Mediated Lateral Metalation of N,N-Dialkyl-o-allyloxymethylbenzamides and o-Substituted Benzyl Prenyl Ethers
Herein we disclose an asymmetric allylation of 3-hydroxyisobenzofuran-1(3H)-ones with boron allylation reagents to construct chiral phthalide derivatives. The simple Bi(OAc)3/chiral phosphoricacid catalytic system proves to be efficient in this method, delivering the desired chiral 3-allylisobenzofuran-1(3H)-ones in good yields (up to 99%) and high enantioselectivities (up to 99.5:0.5 e.r.) under mild
Synthesis of 1‐(3
<i>H</i>
)isobenzofuranone compounds by tin powder promoted cascade condensation reaction
作者:Shangxian Wang、Ke‐Hu Wang、Bo Chang、Danfeng Huang、Yulai Hu
DOI:10.1002/aoc.6249
日期:2021.7
An efficient approach for the construction of phthalide compounds is developed through tin powder mediated cascade condensation reaction of 2-formylbenzoic acids with allyl bromides or α-bromoketone under mild reaction conditions. This method is easy to operate and can tolerate various functional groups to give the corresponding phthalides in good to excellent yields. The phthalides produced from α-bromoketone
通过锡粉介导的 2-甲酰基苯甲酸与烯丙基溴或α-溴酮在温和反应条件下的级联缩合反应,开发了一种有效的邻苯二甲酸酯化合物构建方法。该方法操作简单,可以耐受各种官能团,从而以良好到极好的收率得到相应的邻苯二甲酸酯。由α-溴酮生产的邻苯二甲酸酯可进一步转化为3,3a -dihydro -8 H -pyrazolo [5, l - a ]isoindol-8-one和8 H -pyrazolo[5, l- a ]isoindol-8-一。
A Grignard-Type Addition of Allyl Unit to Carbonyl Compounds Containing a Carboxyl Group by Using BiCl<sub>3</sub>–Zn(0)–Allyl Bromide
In the presence of BiCl3–Zn(0), nearly equimolar amounts of allyl bromide reacted with carbonyl compounds containing a carboxyl group to afford the corresponding homoallylic alcohols having a carboxyl group or the intramolecular dehydrated lactones in good yields.
Allylic gallium reagents, prepared from gallium trichloride and the corresponding allylic Grignard reagents, allylated carbonyl compounds in good yields in an aqueous medium as well as in organic solvent.
Water Accelerated Allylation of Aldehydes by Using Water Tolerant Grignard-Type Allylating Agents from Allylmagnesium Chloride and Various Metallic Salts
allylating agents prepared in situ from allylmagnesium chloride and bismuth trichloride, tin tetrachloride, tin dichloride, antimony trichloride, indium trichloride, or nickel dichloride reacted with aldehydes in THF–H2O to afford the desired homoallylic alcohols in good yields. The present reaction proceeded more smoothly than that under non-aqueous media.