An extremely mild protocol that employs readily available starting materials, i.e., aldehyde, amine and alkyl diazoacetate, returns structurally diverse N-substituted-C-2/3-difunctionalised aziridines in excellent yields and stereoselectivities when pyridinium triflate is incorporated as an organocatalyst. The reaction process is environmentally benign affording water and nitrogen as the only by-products
作者:Sean P. Bew、John Liddle、David L. Hughes、Paolo Pesce、Sean M. Thurston
DOI:10.1002/anie.201611990
日期:2017.5.2
We report a multi-component asymmetric Brønsted acid-catalyzed aza-Darzens reaction which is not limited to specific aromatic or heterocyclic aldehydes. Incorporating alkyl diazoacetates and, important for high ee's, ortho-tert-butoxyaniline our optimized reaction (i.e. solvent, temperature and catalyst study) affords excellent yields (61-98 %) and mostly >90 % optically active cis-aziridines. (+)-Chloramphenicol
Generating cis-aza-diaryl and triaryl ethers via organoBrønsted acid catalysed aza-Darzens chemistry
作者:Sean P. Bew、Simon J. Coles、Mateusz B. Pitak、Wim T. Klooster、Polly-Anna Ashford、Victor Zdorichenko
DOI:10.1016/j.tet.2019.130532
日期:2019.10
report the efficient combination of SNAr and organic Brønsted acid catalysis protocols for the construction of cis-aziridine-derived biaryl and triaryl ethers. Using aza-Darzens chemistry mono-cis-aziridine-biaryl and bis-(cis-aziridine)-triaryl ethers have been generated; these motifs have significant potential as easily synthesised, functionalised precursors of a glycopeptide backbone.
我们报道了S N Ar和有机布朗斯台德酸催化协议的有效结合,用于建设顺式-氮丙啶衍生的联芳基和三芳基醚。使用氮杂-Darzens化学已经产生了单-顺-氮丙啶-联芳基和双-(顺-氮丙啶)-三芳基醚。这些基序具有很强的潜力,就像糖肽骨架的易于合成,功能化的前体一样。
Catalytic Enantioselective Synthesis of Mariline A and Related Isoindolinones through a Biomimetic Approach
作者:Chang Min、Yingfu Lin、Daniel Seidel
DOI:10.1002/anie.201709182
日期:2017.11.27
The catalytic enantioselective synthesis of isoindolinones was achieved through the condensation of 2‐acyl‐benzaldehydes and anilines. In the presence of 1 mol % of a chiral phosphoric acid catalyst, reactions reach completion within 10 min and provide products with up to 98 % ee. Anilines with an ortho t‐butyl group form atropisomeric products, thereby enabling the simultaneous generation of axial