Synthesis of Bridged and Non-Bridged N-Heterocycles, Dichloromethyl- and Formyl-Salicylates, Pyran-4-ones,Chromanes and Isochromanes based on Cyclocondensation Reactions of 1,3-Bis(silyloxy)-1,3-butadienes and Oxime Dianions

10.18453/rosdok_id00000623 Karapetyan, Vahuni Vahuni Karapetyan http://d-nb.info/gnd/140505830 Synthesis of Bridged and Non-Bridged N-Heterocycles, Dichloromethyl- and Formyl-Salicylates, Pyran-4-ones,Chromanes and Isochromanes based on Cyclocondensation Reactions of 1,3-Bis(silyloxy)-1,3-butadienes and Oxime Dianions Universität Rostock 2009 540 Chemistry & allied sciences 2009 en http://purl.uni-rostock.de/rosdok/id00000623 urn:nbn:de:gbv:28-diss2010-0033-9 Regioselective cyclization reactions of 1,3-bis(silyloxy)-1,3-butadienes provide an elegant approach for the synthesis of various complex carba- and heterocycles. Thus, various bridged and non-bridged N-heterocycles, functionalized salicylates and pyran-4-ones are prepared based on cyclization reactions of 1,3-bis(silylenol ethers). Isochromanes and chromanes are prepared based on chelation-controlled cyclization of 1,3-bis(silylenol ethers) with 1,1-diacylcyclopropanes. In addition, 6-halomethyl-5,6-dihydro-4H-1,2-oxazines are synthesized by regioselective cyclization of arylalkenyl-oximes.