Tandem Alkylation−Michael Addition to Vinylogous Carbonates for the Stereoselective Construction of 2,3,3,6-Tetrasubstituted Tetrahydropyrans
作者:Santosh J. Gharpure、S. Raja Bhushan Reddy
DOI:10.1021/ol900721q
日期:2009.6.18
A stereoselective method for the synthesis of substituted tetrahydropyran derivatives employing a tandem SN2−Michael addition sequence to vinylogous carbonates is developed. The method is extended to the synthesis of bicyclic ether motifs present in polyether ladder toxins.
开发了一种立体选择性的合成取代四氢吡喃衍生物的方法,该方法利用串联的S N 2-Michael加成序列到乙烯基碳酸酯。该方法扩展到聚醚梯形毒素中存在的双环醚基序的合成。
Regioselective reductions of 2,3-epoxy alcohols
作者:Steven M. Viti
DOI:10.1016/s0040-4039(00)85648-8
日期:1982.1
Regioselective reduction of 3-substituted-2,3-epoxy alcohols to 1,3-diols with sodiumbis(2-methoxyethoxy)aluminumhydride (Red-al) is shown to be a general reaction for these substitutes.
[EN] CATALYTIC REDUCTIVE CLEAVAGE OF A beta-Omicron-4 BOND OF ETHERS OR POLYETHERS SUCH AS LIGNIN<br/>[FR] CLIVAGE RÉDUCTEUR CATALYTIQUE D'UNE LIAISON Beta-Omicron-4 D'ÉTHERS DE POLYÉTHERS TELS QUE DE LA LIGNINE
申请人:KAT2BIZ AB
公开号:WO2014038989A1
公开(公告)日:2014-03-13
The present invention relates to a method of reducing a β-O-4 bond to the corresponding C-H bond in a substrate, by use of a hydrogen donor and a metal catalyst in a solvent. Thereby it is possible to depolymerize a polymer having a repeating β-O-4 bond.
Invented are novel 1H-imidazo[4,5-c]pyridin-2-yl compounds, the use of such compounds as inhibitors of protein kinase B activity and in the treatment of cancer and arthritis.
Kinetically Controlled Stereoselective Synthesis of 2-Oxo-2-aryl-1,3,2-dioxaphosphorinane Derivatives via a Palladium-Catalyzed Reaction
作者:Hongming Cui、Daizong Lin、Dang Qun、Xu Bai
DOI:10.1021/acs.joc.3c02151
日期:2024.3.1
Chiral phosphonate esters have been widely applied in the fields of organic chemistry, medicine, and photoelectric materials. However, it requires the challenging enantioselective synthesis of cyclic phosphonate esters with the desired chiral configuration. The two epimers of 2-oxo-2H-1,3,2-dioxaphosphorinane derivatives should have different reactivities in Pd-catalyzed couplingreactions, which could lead
手性膦酸酯在有机化学、医药、光电材料等领域有着广泛的应用。然而,它需要具有所需手性构型的环状膦酸酯的对映选择性合成,具有挑战性。 2-oxo-2 H -1,3,2-二氧杂膦烷衍生物的两种差向异构体在Pd催化的偶联反应中应具有不同的反应活性,这可能为2-oxo-2-aryl-的不对称合成提供有效的方法。 1,3,2-二氧杂膦烷衍生物。通过计算和实验对偶联反应进行彻底研究,实现了手性环状膦酸酯的立体选择性合成。在动力学控制的条件下,由2-oxo-2 H -1,3,2-二氧杂膦烷衍生物的混合物可以得到具有高非对映选择性和良好化学收率的轴向异构体产物。