Enzymatic acylation reactions on ω-hydroxycyanohydrins
摘要:
The enzymatic acylation of certain omega-hydroxycyanohydrins protected a, the primary alcohol has been studied. The best enantioselectivities are obtained with Pseudomonas cepacia lipase (PSL-C) and Candida antarctica lipase A (CAL-A), for the omega-O-tritylated cyanohydrins. The effect of the protecting group in the enzymatic reactions has been studied using molecular modeling. (C) 2004 Elsevier Ltd. All rights reserved.
Enzymatic acylation reactions on ω-hydroxycyanohydrins
摘要:
The enzymatic acylation of certain omega-hydroxycyanohydrins protected a, the primary alcohol has been studied. The best enantioselectivities are obtained with Pseudomonas cepacia lipase (PSL-C) and Candida antarctica lipase A (CAL-A), for the omega-O-tritylated cyanohydrins. The effect of the protecting group in the enzymatic reactions has been studied using molecular modeling. (C) 2004 Elsevier Ltd. All rights reserved.
Mild Base Promoted Nucleophilic Substitution of Unactivated
<i>sp</i>
<sup>3</sup>
‐Carbon Electrophiles with Alkenylboronic Acids
作者:Shiwen Liu、Xiaojun Zeng、Gerald B. Hammond、Bo Xu
DOI:10.1002/adsc.201800826
日期:2018.10.4
Diverse alkenylboronic acids react smoothly with various sp3‐carbon electrophiles such as unactivated alkyl triflates in the presence of mild bases such as K3PO4. The reaction protocol is very mild and thereby enables high functional group tolerance. This transition metal‐free condition is orthogonal towards the classic transition metal catalyzed Suzuki coupling.
在温和的碱(例如K 3 PO 4)存在下,不同的烯基硼酸与各种sp 3-碳亲电试剂(例如未活化的烷基三氟甲磺酸酯)平滑反应。反应方案非常温和,因此可以实现较高的官能团耐受性。这种无过渡金属的条件与经典的过渡金属催化的Suzuki偶联正交。
Nickel‐Catalyzed, Reductive C(sp
<sup>3</sup>
)−Si Cross‐Coupling of α‐Cyano Alkyl Electrophiles and Chlorosilanes
作者:Liangliang Zhang、Martin Oestreich
DOI:10.1002/anie.202107492
日期:2021.8.16
A nickel/zinc-catalyzed cross-electrophile coupling of alkylelectrophiles activated by an α-cyano group and chlorosilanes is reported. Elemental zinc is the stoichiometric reductant in this reductivecoupling process. By this, a C(sp3)−Si bond can be formed starting from two electrophilic reactants whereas previous methods rely on the combination of carbon nucleophiles and silicon electrophiles or