已经发现三氯甲磺酰氯(CCl 3 SO 2 Cl),一种可商购的试剂,在非常温和的反应条件下,在醛的α-氯化反应中,包括催化的不对称形式,都能有效地进行醛的氯化反应。在我们的反应条件下,该化合物的性能优于用于有机合成的典型氯化试剂,有助于产品的后处理和纯化,并最大程度地减少了有毒的氯化有机废物的形成。
Cascade Trisulfur Radical Anion (S<sub>3</sub><sup>•–</sup>) Addition/Electron Detosylation Process for the Synthesis of 1,2,3-Thiadiazoles and Isothiazoles
作者:Bei-Bei Liu、Hui-Wen Bai、Huan Liu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b01450
日期:2018.9.7
Trisulfur radical anion (S3•–) mediated reactions with in situ formed azoalkenes and α,β-usaturated N-sulfonylimines for the construction of 1,2,3-thiadiazoles and isothiazoles has been developed. S3•– is in situ generated from potassium sulfide in DMF. These two approaches provide a new, safe, and simple way to construct 4-subsituted 1,2,3-thiadiazoles, 5-subsituted 1,2,3-thiadiazoles, and isothiazole
Electrophilic Zinc Homoenolates: Synthesis of Cyclopropylamines from Cyclopropanols and Amines
作者:L. Reginald Mills、Luis Miguel Barrera Arbelaez、Sophie A. L. Rousseaux
DOI:10.1021/jacs.7b07104
日期:2017.8.23
Metal homoenolates, produced via C-C bond cleavage of cyclopropanols, have been extensively investigated as nucleophiles for the synthesis of β-substituted carbonyl derivatives. Herein, we demonstrate that zinc homoenolates can react as carbonyl-electrophiles in the presence of nucleophilic amines to yield highly valuable trans-cyclopropylamines in good yields and high diastereoselectivities. GSK2879552
通过环丙醇的 CC 键裂解产生的金属均烯醇化物已被广泛研究作为合成 β 取代羰基衍生物的亲核试剂。在此,我们证明了均烯醇锌可以在亲核胺的存在下作为羰基亲电试剂反应,以良好的收率和高非对映选择性产生非常有价值的反式环丙胺。GSK2879552 是一种赖氨酸脱甲基酶 1 抑制剂,目前正在临床试验中用于治疗小细胞肺癌,它是使用这种策略合成的。
Transition-Metal-Free Decarboxylative Propargylic Substitution/Cyclization with either Azolium Enolates or Acyl Anions
作者:Shenci Lu、Jun-Yang Ong、Si Bei Poh、Terence Tsang、Yu Zhao
DOI:10.1002/anie.201801340
日期:2018.5.14
unprecedented transition‐metal‐free propargylic substitution reaction with either azoliumenolates or acyl anions, which are generated from aldehydes under N‐heterocyclic carbene catalysis. This new catalytic activation operates on readily available cyclic propargylic carbamates through decarboxylation, and generates reactive allene intermediates that can undergo divergent cyclization pathways to deliver
Tandem: Allylic alcohols react with N‐chlorosuccinimide (NCS) in a tandem 1,3‐H shift/CCl bond formation leading to α‐chloroketones and α‐chloroaldehydes. The reactions proceed with complete selectivity to give single constitutional isomers of monochlorinated carbonyl compounds. The utility of the transformation is illustrated by the straightforward synthesis of 4,5‐disubstituted 2‐aminothiazoles
Synthesis of Chiral<i>N</i>-Sulfonyl and<i>N</i>-Phosphinoyl α-Halo Aldimine Precursors
作者:Gretchen R. Stanton、Mehmet Göllü、Rebecca M. Platoff、Corinne E. Rich、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1002/adsc.201200864
日期:2013.3.11
aldimines have emerged as an important class of synthetic intermediates. The stability and reactivity of α‐halo aldimines can vary greatly depending on the nitrogen protecting group. A general synthesis of stable, chiral α‐halo‐N‐sulfonyl and N‐phosphinoyl aldimine precursors is presented (42–96% yield). The corresponding α‐halo aldimines can be isolated upon treatment with a mild base. Enantioenriched α‐chloro