Chiral silyl ethers and silanols are important synthetic intermediates and bioactive compounds.In this work,we developed a onepot remote desymmetrization/Peterson-olefination of silacyclopentene oxides with benzoic ac...Chiral silyl ethers and silanols are important synthetic intermediates and bioactive compounds.In this work,we developed a onepot remote desymmetrization/Peterson-olefination of silacyclopentene oxides with benzoic acids in the presence of Martin’s sulfurane.This new methodology not only realizes the atom-economy of Peterson olefination,but also represents a catalytic method for synthesis of silicon-stereogenic silyl ethers.Using a bulky chiral phosphoric acid 4i as organocatalyst,the reactions proceeded efficiently to afford various olefin-functionalized organosilyl ethers in excellent diastereoelectivities(up to 25/1 d.r.)and high enantioselectivities(up to 94%ee).展开更多
A series of of amphiphilic imidazole based secondary and primary amine catalysts were synthesized and shown to be very effective with an acid cocatalyst for the asymmetric reaction of cyclohexanone to β,γ-unsaturat...A series of of amphiphilic imidazole based secondary and primary amine catalysts were synthesized and shown to be very effective with an acid cocatalyst for the asymmetric reaction of cyclohexanone to β,γ-unsaturated α-keto ester.Interestingly,primary and secondary amine catalysts show different regio-selectivities in this reaction.Under the catalysis of secondary amine 1,excellent enantioselectivities were observed for the products from direct 3+3 reactions of cyclohexanone withβ,γ-unsaturated α-keto esters using water as the solvent.Moreover,the same reactants catalyzed by the primary amines 2 lead to the aldol reactions,affording the corresponding products with high diastereoselectivities and up to 97%ee.Theoretical studies on the transition states by using a model in gas phase revealed that steric effect plays an important role on different chemo-selective induction between the secondary amine 1 and primary amine 2.展开更多
基金supported by the National Natural Science Foundation of China(22271276,21871254,21702203)the National Key Research and Development Program of China(2022YFC2105900)。
文摘Chiral silyl ethers and silanols are important synthetic intermediates and bioactive compounds.In this work,we developed a onepot remote desymmetrization/Peterson-olefination of silacyclopentene oxides with benzoic acids in the presence of Martin’s sulfurane.This new methodology not only realizes the atom-economy of Peterson olefination,but also represents a catalytic method for synthesis of silicon-stereogenic silyl ethers.Using a bulky chiral phosphoric acid 4i as organocatalyst,the reactions proceeded efficiently to afford various olefin-functionalized organosilyl ethers in excellent diastereoelectivities(up to 25/1 d.r.)and high enantioselectivities(up to 94%ee).
基金the Natural Science Foundation of China(Nos.21322202,2100210)National Basic Research Program of China(No.2010CB833300).
文摘A series of of amphiphilic imidazole based secondary and primary amine catalysts were synthesized and shown to be very effective with an acid cocatalyst for the asymmetric reaction of cyclohexanone to β,γ-unsaturated α-keto ester.Interestingly,primary and secondary amine catalysts show different regio-selectivities in this reaction.Under the catalysis of secondary amine 1,excellent enantioselectivities were observed for the products from direct 3+3 reactions of cyclohexanone withβ,γ-unsaturated α-keto esters using water as the solvent.Moreover,the same reactants catalyzed by the primary amines 2 lead to the aldol reactions,affording the corresponding products with high diastereoselectivities and up to 97%ee.Theoretical studies on the transition states by using a model in gas phase revealed that steric effect plays an important role on different chemo-selective induction between the secondary amine 1 and primary amine 2.
