Conjugate Addition of Organomagnesium Cuprates to Guvacine Derivatives
作者:Tim Hellenbrand、Klaus T. Wanner
DOI:10.1002/ejoc.201402259
日期:2014.7
The synthesis of 4-substituted piperidine-3-carboxylates was achieved by conjugateaddition of organomagnesium cuprates to N-methyl and N-tert-butoxycarbonyl guvacine derivatives. Good to excellent yields were obtained with primary Grignard reagents containing alkyl, alkenyl, alkynyl, or masked aldehyde groups in a copper(I)-trimethylsilylacetylide-catalysed and chlorotrimethylsilane (TMSCl) mediated
Spiranes synthesis based on samarium diiodide-mediated reductive cyclization
作者:Day-Shin Hsu、Chi-Wei Hsu
DOI:10.1016/j.tetlet.2012.02.068
日期:2012.4
A general and efficient method for the preparation of spiro compounds is described. Enone–aldehydes were exposed to samarium diiodide under mild conditions and various spirocyclic γ-hydroxyketones were obtained in good yields.