@article { ISI:000237651600007, title = {Palladium mediated cycloisomerization of sugar alkynols: synthesis of cyclic enol-ethers and spiroketals}, journal = {Tetrahedron Letters}, volume = {47}, number = {22}, year = {2006}, month = {MAY}, pages = {3649-3652}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Functionalized bicyclic enol-ethers and spiroketals are prepared by Pd catalyzed cycloisomerization of 3-C-alkynylfuranosyl derivatives. Cycloisomerization of differently substituted alkyne derivatives revealed a preference for 6-endo-dig cyclization over 5-exo-dig if the substituent is not sufficiently electron withdrawing. The scope of these cycloisomerizations has been further extended by integrating with conjugate addition. (c) 2006 Elsevier Ltd. All rights reserved.

}, keywords = {c-alkynylfuranose, cycloisomerization, enol-ether, Palladium, Spiroketal}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2006.03.143}, author = {Ramana, C. V. and Mallik, Rosy and Gonnade, Rajesh G. and Gurjar, Mukund K.} } @article { ISI:000254901800024, title = {Influence of electronic factors on palladium-mediated cycloisomerization: a systematic investigation of competitive 5-exo-dig versus 6-endo-dig cyclizations of sugar alkynols}, journal = {Tetrahedron}, volume = {64}, number = {1}, year = {2008}, month = {JAN}, pages = {219-233}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Pd-mediated cycloisomerization of 3-C-alkynyl-allo- and ribofuranose derivatives was investigated in detail to understand the influence of electronic factors on the regioselectivity in ring closure reaction. The reactions in general are influenced by the electronic nature of the substituent on the alkyne unit. A preference for endo-dig cyclization over exo-dig is noted, if the alkynyl substituent is not sufficiently electron withdrawing, (c) 2007 Elsevier Ltd. All rights reserved.

}, keywords = {C-alkynyl furanose, cycloisomerization, enol ether, Palladium, Spiroketal}, issn = {0040-4020}, doi = {10.1016/j.tet.2007.10.072}, author = {Ramana, C. V. and Mallik, Rosy and Gonnade, Rajesh G.} } @article { ISI:000268508900011, title = {Pd-mediated intramolecular ketalization of alkynediols: construction of the central [3.2.1]-bicyclic ketal core of cyclodidemniserinol trisulfate}, journal = {Tetrahedron Letters}, volume = {50}, number = {34}, year = {2009}, month = {AUG}, pages = {4844-4847}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A preliminary study dealing with the Pd-mediated alkynediol cycloisomerization to construct the central bicyclic ketal core of cyclodidemniserinol trisulfate is documented. (c) 2009 Elsevier Ltd. All rights reserved.

}, keywords = {Alkynol cycloisomerization, Bridged bicyclic ketal, Cyclodidemniserinol trisulfate, Yamaguchi oxirane-alkyne coupling}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2009.06.023}, author = {Ramana, C. V. and Mallik, Rosy and Sahoo, Gokarneswar} } @article { ISI:000286789100007, title = {Target cum flexibility: an alkyne [2+2+2]-cyclotrimerization strategy for synthesis of trinem library}, journal = {Tetrahedron Letters}, volume = {52}, number = {1}, year = {2011}, month = {JAN}, pages = {38-41}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A rapid access to the central 4,5,6-tricyclic core of 4,5,6-trinems has been achieved by employing the alkyne [2+2+2]-cyclotrimerization as the key and final reaction in the synthesis. (C) 2010 Elsevier Ltd. All rights reserved.

}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2010.10.123}, author = {Ramana, C. V. and Dushing, Mangesh P. and Mohapatra, Sradhanjali and Mallik, Rosy and Gonnade, Rajesh G.} }