Direct one-pot conversion of acylated carbohydrates into their alkylated derivatives under heterogeneous reaction conditions using solid NaOH and a phase transfer catalyst
作者:Soni Kamlesh Madhusudan、Geetanjali Agnihotri、Devendra S. Negi、Anup Kumar Misra
DOI:10.1016/j.carres.2005.03.007
日期:2005.5
A convenient one-pot protocol for the direct conversion of acyl-protected carbohydrates into their alkylated counterparts has been developed by using alkyl halides in the presence of solid sodium hydroxide and a phase transfer catalyst. These economically convenient, mild, two-phase reaction conditions allow the preparation of a variety of monosaccharide intermediates for use in the synthesis of complex
Bi(OTf)<sub>3</sub>as Novel and Efficient Catalyst for the Stereoselective Synthesis of<i>C</i>-Pseudoglycals
作者:J. S. Yadav、B. V. S. Reddy、K. Srinivasa Reddy、L. Chandraiah、V. Sunitha
DOI:10.1055/s-2004-831187
日期:——
d-Glycals undergo smoothly allylic rearrangement with allyltrimethylsilane and trimethylsilyl cyanide in the presence of catalytic amount of bismuth triflate to afford the corresponding 2,3-unsaturated allyl glycosides and glycosyl cyanides in excellent yields with high α-selectivity.
Efficient carbon-Ferrier rearrangement on glycals mediated by ceric ammonium nitrate: Application to the synthesis of 2-deoxy-2-amino-<i>C</i>-glycoside
作者:Alafia A Ansari、Y Suman Reddy、Yashwant D Vankar
DOI:10.3762/bjoc.10.27
日期:——
A carbon-Ferrier rearrangement on glycals has been performed by using ceric ammonium nitrate to obtain products in moderate to good yields with high selectivity. The versatility of this method has been demonstrated by applying it to differently protected glycals and by employing several nucleophiles. The obtained C-allyl glycoside has been utilized for the synthesis of a orthogonally protected 2-a
to observe this ionic species, its extended lifetime in superacid solutions allowed its characterization by NMR‐based structural analysis supported by DFT calculations. This allyloxycarbenium ion was further exploited in the Ferrier rearrangement to afford unsaturated nitrogen‐containing C‐aryl glycosides and C‐alkyl glycosides under superacid and flow conditions, respectively.