Silica Jar‐with‐Lid as Chemo‐Enzymatic Nano‐Compartment for Enantioselective Synthesis inside Living Cells
作者:Seonock Kim、Nitee Kumari、Jongwon Lim、Sateesh Dubbu、Amit Kumar、In Su Lee
DOI:10.1002/anie.202103165
日期:——
synthetic catalysts and enzymes to perform enantioselectivesynthesisinsidecell, have never been reported. Here, we synthesized round bottom jar-like silica nanostructures (SiJARs) with a chemo-responsive metal-silicate lid. This was isolated as an intermediate structure during highly controlled solid-state nanocrystal-conversion at the arc-section of silica shell. Different catalytic noble metals (Pt
从未报道过利用合成催化剂和酶的力量在细胞内进行对映选择性合成的纳米装置。在这里,我们合成了带有化学响应金属硅酸盐盖的圆底罐状二氧化硅纳米结构 ( SiJAR ) 。这是在二氧化硅壳的弧形截面处高度受控的固态纳米晶体转化过程中作为中间结构被分离出来的。不同的催化贵金属(Pt、Pd、Ru)通过电流反应在盖子部分被选择性地改性。还有,盖子孔径受温和的酸性条件或容纳金属纳米晶体和酶的细胞内环境调节,进而产生开口纳米反应器。与游离酶不同,SiJAR s 进行不对称醛醇反应,具有高活性和对映选择性(产率 >99%,ee =95%),并且还充当活细胞内的人工催化细胞器。这项工作将复杂的纳米晶体转化化学和用于新自然催化的先进平台的巨大潜力联系起来。
Unexpected Beneficial Effect of ortho-Substituents on the (S)-Proline-Catalyzed Asymmetric Aldol Reaction of Acetone with Aromatic Aldehydes
作者:Benjamin List、Alberto Martínez、Manuel van Gemmeren
DOI:10.1055/s-0033-1340920
日期:——
An intriguing effect of electronegative 2,6-substituents on the stereochemical outcome of (S) -proline-catalyzed aldol reactions between benzaldehyde derivatives and acetone is reported. Remarkably high enantioselectivities can be achieved with such substrates.
Chiral Diols: A New Class of Additives for Direct Aldol Reaction Catalyzed by <scp>l</scp>-Proline
作者:Yan Zhou、Zixing Shan
DOI:10.1021/jo060802y
日期:2006.12.1
Nine C2 symmetric diols have been examined as additives in the l-proline-catalyzed directaldolreaction with significant improvement in enantioselectivity, conversion efficiency, and yield. Loading of 1 mol % of (S)-BINOL leads to the desired products in up to 98% ee and 90% yield. A transition state is proposed.
(R)- or (S)-Bi-2-naphthol assisted, l-proline catalyzed direct aldol reaction
作者:Yan Zhou、Zixing Shan
DOI:10.1016/j.tetasy.2006.06.022
日期:2006.7
Chiral Bronsted acids (R)- and (S)-BINOL were employed as additives in the classic L-proline catalyzed direct aldol reaction. Eighteen substrates were tested with 0.5 mol % (R)-BINOL loading and 1 mol % of (S)-BINOL loading, and the enantioselectivity was improved from 72% ee without additive to 98% ee. In the proposed transition state, the chiral Bronsted acid promoted the reaction through hydrogen bonding, which not only activated the carbonyl group but also stabilized the transition state. (c) 2006 Elsevier Ltd. All rights reserved.
Tetrahydrobenzo[5]helicenediol derivatives as additives for efficient proline-catalyzed asymmetric List-Lerner-Barbas aldol reactions of bulky aldehyde substrates
作者:Lei Fang、Weibin Lin、Chuanfeng Chen
DOI:10.1016/j.cclet.2018.06.007
日期:2018.8
Abstract Tetrahydrobenzo[5]helicenediol (THB-[5]HDIOL) derivatives as additives for the efficient proline-catalyzed asymmetric List-Lerner-Barbas (LLB) aldol reactions of bulky aldehyde substrates was described. It was found that with dibromo-substituted helical diols P-4a/M-4a as additives, the proline-catalyzed LLB aldol reaction of 9-anthraldehyde and acetone gave the product in 83% yield and 99%