A convenient synthesis of new diamine, amino alcohol and aminophosphines chiral auxiliaries based on limonene oxide
摘要:
A strategy for the synthesis of new chiral auxiliaries based upon vicinal diamines, amino alcohols and aminophosphines, obtained from limonene oxide, has been developed. The methodology allows the preparation of (1R,2R,4S)-1-methyl-4-(prop-1-en-2-yl)cyclohexane-1,2-diamine starting from a commercially available mixture of cis/trans (4S)-(-)-limonene oxides, through a stereoconvergent synthetic sequence. The process starts from an inexpensive naturally occurring material, is amenable to scale-up and allows easy access to highly useful enantiopure building blocks and ligands, employed in asymmetric catalysis. (C) 2009 Elsevier Ltd. All rights reserved.
Scaleable Syntheses of Isomeric Limonene Aziridines from the Commercially Available Mixture of cis- and trans-Limonene Oxides
摘要:
A short and efficient route to both isomers of limonene aziridine is described. The process is amenable to scale-up and allows easy access to multigram quantities of these highly useful chiral building blocks.