Generation of 4-iodoisocoumarins through a TBAI-mediated oxidative cyclization of 2-alkynoates
摘要:
A tetra-butylammonium iodide (TBAI)-mediated oxidative iodocyclization of 2-alkynoates for the synthesis of various 4-iodoisocoumarin is described herein, and the reaction is highly efficient and shows broad functional group tolerance. This newly developed reaction uses a mixture of water and DCE as co-solvent, and avoids the use of iodine as iodine source for the electrophilic halocyclization.[GRAPHICS].
Use of iodine for efficient and chemoselective glycosylation with glycosyl ortho-alkynylbenzoates as donor in presence of thioglycosides
作者:Samrat Dutta、Swarbhanu Sarkar、Shyam Ji Gupta、Asish Kumar Sen
DOI:10.1016/j.tetlet.2012.11.101
日期:2013.2
A novel and high yielding glycosylation protocol with glycosyl ortho-alkynylbenzoates as donors and iodine as promoter is described. The donors are stable and can be chemoselectively activated in the presence of thioethyl and thiophenyl glycosides. The application of this methodology in one-pot consecutive glycosylation reaction is described. (C) 2012 Elsevier Ltd. All rights reserved.