(−)-8-Amino menthol-derived perhydrobenzoxazines as chiral templates and masked aldehydes in the diastereoselective intermolecular Pauson–Khand reaction
作者:Alicia Maestro、Rafael Pedrosa、Alfonso Pérez-Encabo、Juan J. Pérez-Rueda
DOI:10.1016/j.tet.2012.08.006
日期:2012.11
Perhydro-1,3-benzoxazines derivedfrom (−)-8-amino menthol behave as masked aldehydes and chiral templates in diastereoselectiveintramolecularPauson–Khandreactions with norbornene and norbornadiene. The regioselectivity is excellent for unsubstituted or methyl-substituted acetylenes and moderate with phenyl-substituted alkynes. The stereoselection is very poor or moderate depending also on the substitution
Studies on the Diastereoselective Intramolecular Pauson-Khand Reaction on Regioisomeric Chiral Perhydrobenzoxazines Derived from (-)-8-Aminomenthol
作者:Alicia Maestro、Rafael Pedrosa、Alfonso Pérez-Encabo、Juan J. Pérez-Rueda
DOI:10.1002/ejoc.201101462
日期:2012.2
Chiralperhydrobenzoxazinesderivedfrom (–)-8-aminomenthol and containing a 1,6-enyne moiety participate in intramoleculardiastereoselectivePauson–Khandreactions with diastereoselection that depends on the nature of the starting compounds. 3-Propargyl-2-vinyl-substituted perhydrobenzoxazines yielded the cyclization products with low diastereoselectivity except for compounds where the double bond