A Direct Synthesis of Highly Substituted π‐Rich Aromatic Heterocycles from Oxetanes
作者:Alexander R. White、Ryan A. Kozlowski、Shiou‐Chuan Tsai、Christopher D. Vanderwal
DOI:10.1002/anie.201704119
日期:2017.8.21
five-membered heterocycles has driven the development of new methods for their synthesis for more than a century. Here, we disclose a general and reliable reaction manifold for the construction of highly substituted heterocycles through a facile Lewis-acid-catalyzed oxetane rearrangement. Notably, this methodology employs a keto-oxetane motif as a 1,4-dicarbonyl surrogate, which can be synthesized using
Syntheses of highly functionalised 6-substituted pteridines
作者:Donie Guiney、Colin L. Gibson、Colin J. Suckling
DOI:10.1039/b211564f
日期:2003.2.11
Methods for the synthesis of polyfunctional 6-substituted pteridines from the corresponding 6-aldehydes are described. Alkene, ester, ketone, amide, cyano, oxime, bromo, methoxy and dihydroxy functional groups have all been introduced principally through improved methodologies for Wittig reactions using 2-thioalkyl-6-formylpteridines as substrates. Further modification of the alkenes derived from the
Preparation and Chemistry of Phosphoranyl-Derived Iodanes
作者:Viktor V. Zhdankin、Olena Maydanovych、Jon Herschbach、Jessica Bruno、Elena D. Matveeva、Nikolai S. Zefirov
DOI:10.1021/jo026604y
日期:2003.2.1
synthetic advantages of a phosphoniumylide and an iodonium salt. Specifically, phosphorane-derived phenyliodonium tosylates can react with soft nucleophiles, such as iodide, bromide, benzenesulfinate, and thiophenolate anions, with a selective formation of the respective alpha-functionalized phosphoniumylides, which can be further converted to alkenes by the Wittig reaction with benzaldehyde. The
Solventless Wittig Olefination with Fluorinated Benzaldehydes
作者:Thies Thiemann
DOI:10.3184/030823407x225464
日期:2007.6
Fluorinated benzaldehydes undergo solventless Wittig olefination with stabilisedphosphoranes. Even with less reactive, stabilisedphosphoranes, such as acetylmethylidenetriphenylphosphorane, the reactions have been found to be exothermic.
Synthesis of carbon 1 C-.beta.-D-ribofuranosyl derivatives with a highly functionalized two-carbon unit. Conversion to certain blocked thiazole C-nucleosides