A NEW STABLE MODIFIED BOROHYDRIDE REAGENT, EFFICIENT REDUCTION OF DIFFERENT FUNCTIONAL GROUPS WITH SULFURATED BARIUM BOROHYDRIDE [BA(BH2S3)2] IN DRY THF
摘要:
Barium and strontium sulfurated borohydrides, Ba(BH2S3)(2),Sr(BH2S3)(2) the two newly introduced modified borohydride agents, are prepared from NaBH2S3 by metathesis reaction with BaCl2 and SrCl2 in good yields. Ba(BH2S3)(2) is more stable and more reactive than Sr(BW2S3)(2) The reducing ability of Ba(BH2S3)(2) for the reduction of aldehydes, ketones, alpha,beta -unsaturared carbonyl compounds, azides, nitro compounds, and cleavage of epoxides in dry THF is described.
Synthesis of aryl azides and vinyl azides via proline-promoted CuI-catalyzed coupling reactionsElectronic supplementary information (ESI) available: experimental procedures. See http://www.rsc.org/suppdata/cc/b4/b400878b/
作者:Wei Zhu、Dawei Ma
DOI:10.1039/b400878b
日期:——
The coupling reaction of aryl halides or vinyl iodide with sodium azide under catalysis of CuI/L-proline works at relatively low temperature to provide arylazides or vinyl azides in good to excellent yields.
Thermal and photochemical annulation of vinyl azides to 2-aminoimidazoles
作者:Lucas Man、Royston C. B. Copley、Anthony L. Handlon
DOI:10.1039/c9ob01100e
日期:——
tandem addition cyclization reaction of vinyl azides and cyanamide has been investigated. These reactions proceeded through either thermal or photochemical activation of vinyl azides and demonstrated wide substrate scope. In the photochemicalreaction, blue light (456 nm) alone triggered photolysis of the azide without the addition of a photocatalyst. Possible reactionmechanisms in the context of substrate
Simple and facile method for the preparation of vinyl azides
作者:Vikas N. Telvekar、Balaram S. Takale、Harshal M. Bachhav
DOI:10.1016/j.tetlet.2009.06.097
日期:2009.9
A synthetic utility of [bis(trifluoroacetoxy)iodo]benzene on α,β-unsaturated carboxylicacid is described. This is the first example of preparation of vinyl azide using α,β-unsaturated carboxylicacids directly by using hypervalent iodine reagent. The advantage of this protocol is characterized with non-toxicity of starting material and shorter reaction times to obtain good preparative yields. The