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Dioxygenated cyclopentenones are versatile building blocks for the synthesis of several natural products. Herein we report a direct asymmetric synthesis of trans -4,5-dioxygenated cyclopentenone derivatives through base-catalyzed rearrangement of pyranones followed by dynamic kinetic resolution....
Reaction of aryltrimethylsilanes with xenon difluoride in C 6 F 6 /Pyrex ® at room temperature gives aryl fluorides in good yield. The reaction is inhibited when acetonitrile is used as solvent but proceeds well in CFCl 3 /Pyrex ® or CH 2 Cl 2 /Pyrex ® . Pyrex ® appears to be a very effective...
Efficient methods for the preparation of isomeric o , o ′-diaminobibenzothiazoles ( 8a and 11a ) and o , o ′-diamino-2,2′-dimethylbibenzothiazoles ( 8b and 11b ), potentially valuable building blocks for construction of hitherto unknown dithiazolo annulated pentacyclic heterocycles, have...
An effective, convenient, and mild coupling reaction of benzylic alcohols with terminal alkynes has been developed. As an effective Lewis acid, Cu(OTf) 2 -catalyzed arylmethylation of terminal alkynes with benzylic alcohols generated the corresponding products in BrCH 2 CH 2 Br with good yields...
A concise synthesis of two diastereomers of (+)-castanospermine namely 1- and 8a- epi -castanospermine 1b and 1c , respectively, is reported from d -glucose. The methodology involves stereoselective cross metathesis of d -glucose derived alkene 2 with 4-bromo-1-butene followed by azide...
The recent isocyanide-based synthesis of various types of heterocycles is reviewed. The report contains 98 references.
A new highly selective, reversible, chromogenic, and fluorogenic chemosensor ( 4 ) based on thiazole–coumarin moieties for quantification of copper ions in aqueous-DMSO was designed and synthesized. The mechanism of fluorescence was based on ICT, which was modified by the introduction of an...
A novel one-pot protocol for the syntheses of 2-chloro-pyrrolo(3,2- d )pyrimidines was described. A series of 2-chloro-pyrrolo(3,2- d )pyrimidines were prepared from readily available starting materials in moderate to good yields using this methodology.
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