Simple Open-Chain Phosphite-Olefin as Ligand for Rh-Catalyzed Asymmetric Arylation of Cyclic Ketimines: Enantioselective Access to gem-Diaryl α-Amino Acid Derivatives
作者:Yi Li、Yue-Na Yu、Ming-Hua Xu
DOI:10.1021/acscatal.5b02403
日期:2016.2.5
exceptionally mild and user-friendly conditions using a H8-binol-derived phosphite-olefin ligand. The method is useful in offering efficient and convenient synthesis of enantioriched α,α-diaryl-α-amino acid amides and nitrogen-containing heterocycles. Furthermore, by taking advantage of the protocol, the first enantioselective synthesis of BACE1 inhibitor (R)-iminohydantoin has been accomplished.
新型的基于开链手性亚磷酸酯的杂化烯烃配体已经开发出来,并用于Rh催化的1,2,5-噻二唑烷1,1-二氧化物型环状酮亚胺的不对称芳基化反应中。在异常温和且用户友好的条件下,使用四氢呋喃反应可生成具有季铵盐的,含季碳的,二-二芳基取代的磺胺二氢嘧啶和4-乙氧基-2,3-二氢-1,2,5-噻二唑1,1-二氧化物,具有出色的对映选择性。 H 8-联苯酚衍生的亚磷酸酯-烯烃配体。该方法可用于提供对映异构的α,α-二芳基-α-氨基酸酰胺和含氮杂环的有效和方便的合成。此外,通过利用该方案,已经完成了BACE1抑制剂(R)-亚氨基乙内酰脲的首次对映选择性合成。
Diastereo- and enantioselective Mannich/cyclization cascade reaction of isocyanoacetates with cyclic sulfamide ketimines by cinchona alkaloid squaramide/AgOAc cooperative catalysis
作者:Mei-Xin Zhao、Zhi-Wen Dong、Guang-Yu Zhu、Xiao-Li Zhao、Min Shi
DOI:10.1039/c8ob01090k
日期:——
an efficient diastereo- and enantioselective Mannich/cyclization cascade reaction of α-substituted isocyanoacetates with 4-aryl-3-carbonyl-1,2,5-thiadiazole-1,1-dioxide type cyclic sulfamide ketimines cooperatively catalyzed by cinchona alkaloid-derived squaramide and AgOAc. The corresponding opticallyactive 2,3,3a,4-tetrahydroimidazo[1,5-b][1,2,5]thiadiazole-1,1-dioxide derivatives were obtained
我们已经开发了由金鸡纳生物碱协同催化的α-取代异氰基乙酸酯与4-芳基-3-羰基-1,2,5-噻二唑-1,1-二氧化物型环硫酰胺酮亚胺的高效非对映和对映选择性曼尼希/环化级联反应衍生的方胺和AgOAc。获得了相应的旋光性2,3,3a,4-四氢咪唑并[1,5- b ] [1,2,5]噻二唑-1,1-二氧化物衍生物,收率极高(高达99%)立体选择性(高达> 20:1 dr,高达94%ee)。
Enantioselective aza-Friedel–Crafts reaction of cyclic ketimines with indoles using chiral imidazoline–phosphoric acid catalysts
An enantioselective aza-Friedel Crafts reaction of cyclic 4-aryl-3-oxo-1,2,5-thiadiazol-1,1-oxides as cyclic ketimines with indoles was developed. High enantioselectivities were observed for the reaction of various cyclic ketimines with indoles using chiral imidazoline–phosphoric acid catalysts. The obtained products can be converted to chiral α-amino amide and hydantoin.