Tellurium/lithium exchange reactions in the synthesis of spiroketals and 1, 6-dioxygenated systems

AA Dos Santos, JL Princival, JV Comasseto…

Index: Dos Santos, Alcindo A.; Princival, Jefferson L.; Comasseto, Joao V.; de Barros, Simone M.G.; Neto, Jose E. Brainer Tetrahedron, 2007 , vol. 63, # 24 p. 5167 - 5172

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Citation Number: 20

Abstract

1, 4-C, O-dianions have been generated through concomitant acid/base and tellurium/lithium exchange reactions. The di-lithium salts were transmetallated with cerium chloride to the corresponding di-cerium salts and subsequently reacted with lactones and carboxylic acid anhydrides to yield the respective spiroketals. The di-lithium entities were also converted into the corresponding cyanocuprates that add in a 1, 4-manner to 2- ...