Asymmetric Reaction of α-Diazomethylphosphonates with α-Ketoesters To Access Optically Active α-Diazo-β-hydroxyphosphonate Derivatives
作者:Fei Du、Jiao Zhou、Yungui Peng
DOI:10.1021/acs.orglett.7b00128
日期:2017.3.17
The first example for asymmetric reaction of diazomethylphosphonates with α-ketoesters was realized in the catalysis of hydroquinidine-derived bifunctional thiourea. A methodology was established to access a series of chiral α-diazo-β-hydroxyphosphonate derivatives containing various functional groups with high enantioselectivities and yields. The resulting products could be further transformed into
Just mix to get six: Sixcontiguousstereocenters, including one quaternary stereocenter, and three CC bonds are created by a new copper‐catalyzed tandem reaction (see scheme). Rigid chiral diamine ligands enabled this asymmetric tandem reaction to proceed with excellent stereoselectivity (complete diastereoselectivity and high enantioselectivity) and high yield under mild reaction conditions.
Nickel(II)‐Catalyzed Diastereo‐ and Enantioselective Michael/ Hemiacetalization Cascade Reaction of α‐Ketoesters with 2‐(2‐Nitrovinyl)phenols
作者:Long Chen、Wu‐Lin Yang、Jia‐Huan Shen、Wei‐Ping Deng
DOI:10.1002/adsc.201900753
日期:2019.10.8
A nickel(II)/diamine‐catalyzed diastereo‐ and enantioselective Michael/hemiacetalization cascade reaction of α‐ketoesters with 2‐(2‐nitrovinyl)phenols has been established, thus providing a range of structurally diverse polysubstituted chromanes in good yields and excellent stereoselectivities (up to 89% yield, >20:1 dr, >99% ee). Moreover, the gram‐scale experiment was performed with only 0.5 mol%
An Efficient Asymmetric Biomimetic Transamination of α-Keto Esters to Chiral α-Amino Esters
作者:Xiao Xiao、Mao Liu、Chao Rong、Fazhen Xue、Songlei Li、Ying Xie、Yian Shi
DOI:10.1021/ol302427d
日期:2012.10.19
An efficient asymmetric biomimetic transamination of α-ketoesters with quinine derivatives as chiral bases was described. A wide variety of α-amino esters containing various functional groups can be synthesized in high yield and enantioselectivity.
Nickel(II)-Catalyzed Diastereo- and Enantioselective [3+2] Cycloaddition of α-Ketoesters with 2-Nitrovinylindoles and 2-Nitrovinylpyrroles
作者:Wu-Lin Yang、Zhong-Tao Sun、Hao Sun、Wei-Ping Deng
DOI:10.1002/cjoc.201800572
日期:2019.3
The catalyticasymmetric [3+2] cycloaddition of α‐ketoesters with 2‐nitrovinylindoles and 2‐nitrovinyl‐ pyrroles has been established. This strategy allowed the construction of structurally diverse pyrrolo[1,2‐a]indoles bearing three contiguous stereocenters in generally high yields and good to excellent stereoselectivities (up to 98% yield, > 98 : 2 dr, 99% ee). The efficient synthesis of tetracyclic
建立了α-酮酸酯与2-硝基乙烯基吲哚和2-硝基乙烯基吡咯的催化不对称[3 + 2]环加成反应。该策略允许构建具有三个连续立体中心的结构多样的吡咯并[1,2- a ]吲哚,且通常具有高产率和良好至优异的立体选择性(产率高达98%,> 98:2 dr,99%ee)。通过环加合物的衍生化有效合成四环精神化合物类似物显示了该策略的巨大合成潜力。