A Catalytic Enantioselective Conjugate Addition of Cyanide to Enones
作者:Yuta Tanaka、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1021/ja801201r
日期:2008.5.1
The first synthetically useful catalytic enantioselectiveconjugateaddition of cyanide to enones is described. The optimized conditions involved a Gd catalyst (5 or 10 mol %) derived from ligands 3 or 4 and a 1:1 ratio of TBSCN and 2,6-dimethylphenol. The reaction exhibited excellent to high enantioselectivity and a wide substrate scope. Moreover, the 1,4-adduct was exclusively produced over the 1
Organocatalytic stereoselective cyanosilylation of small ketones
作者:Hui Zhou、Yu Zhou、Han Yong Bae、Markus Leutzsch、Yihang Li、Chandra Kanta De、Gui-Juan Cheng、Benjamin List
DOI:10.1038/s41586-022-04531-5
日期:2022.5.5
Enzymatic stereoselectivity has typically been unrivalled by most chemical catalysts, especially in the conversion of small substrates. According to the ‘lock-and-key theory’1,2, enzymes have confined active sites to accommodate their specific reacting substrates, a feature that is typically absent from chemical catalysts. An interesting case in this context is the formation of cyanohydrins from ketones
Peroxygenase-Catalyzed Allylic Oxidation Unlocks Telescoped Synthesis of (1<i>S</i>,3<i>R</i>)-3-Hydroxycyclohexanecarbonitrile
作者:Christian M. Heckmann、Moritz Bürgler、Caroline E. Paul
DOI:10.1021/acscatal.4c00177
日期:2024.3.1
functional group, yet several chemical allylicoxidation strategies proved unsuccessful. Enzymatic strategies for allylicoxidation are underdeveloped, with few examples on selected substrates with cytochrome P450s and unspecific peroxygenases (UPOs). In this case, UPOs were found to catalyze the desired allylicoxidation with high chemo- and regioselectivity, at substrate loadings of up to 200 mM
酶无与伦比的化学、区域和立体选择性使其成为手性活性药物成分 (API) 合成中的强大催化剂。受 LPA 1拮抗剂 BMS-986278 发现路线的启发,设想使用烯还原酶 (ER) 和乙醇脱氢酶 (ADH) 来获取 API 构建模块 (1 S ,3 R )-3-羟基环己烷甲腈立体中心。从市售的环己烯-1-腈开始,需要一个C-H氧官能化步骤来引入酮官能团,但几种化学烯丙基氧化策略被证明是不成功的。烯丙基氧化的酶促策略尚不成熟,关于细胞色素 P450 和非特异性过氧化酶 (UPO) 的选定底物的例子很少。在这种情况下,UPO 被发现能够在底物负载量高达 200 mM 的情况下以高化学和区域选择性催化所需的烯丙基氧化,无需添加有机共溶剂,从而能够以三步法进行后续的 ER 和 ADH 步骤-锅级联。 UPO 甚至表现出未报道的对映选择性氧官能化和取代环己烯的过度氧化。经过酶组筛选后,最终产物的滴度为
Willaert, Jan J.; Lemiere, Guy L.; Dommisse, Roger A., Bulletin des Societes Chimiques Belges, 1984, vol. 93, # 2, p. 139 - 150
作者:Willaert, Jan J.、Lemiere, Guy L.、Dommisse, Roger A.、Lepoivre, Joseph A.、Alderweireldt, Frank C.
DOI:——
日期:——
Identification and Implementation of Biocatalytic Transformations in Route Discovery: Synthesis of Chiral 1,3-Substituted Cyclohexanone Building Blocks
作者:Timin Hadi、Alba Dı́az-Rodrı́guez、Diluar Khan、James P. Morrison、Justin M. Kaplan、Kathleen T. Gallagher、Markus Schober、Michael R. Webb、Kristin K. Brown、Douglas Fuerst、Radka Snajdrova、Gheorghe-Doru Roiban
DOI:10.1021/acs.oprd.8b00139
日期:2018.7.20
three enzymatic strategies. Reaction optimization and scale-up enabled the production of chiral intermediates for route scouting efforts on scales of up to 100 g. The enzymes applied in these processes (lipases, enoate reductases, and nitrilases) have been shown to be robust catalysts for drug manufacturing and represent a green alternative to conventional methods to access these chiral cyclohexanone