Asymmetric Hydroformylation of an Enantiomerically Pure Bicyclic Lactam: Efficient Synthesis of Functionalised Cyclopentylamines
作者:Gary M. Noonan、Christopher J. Cobley、Tomas Lebl、Matthew L. Clarke
DOI:10.1002/chem.201002233
日期:2010.11.15
Customising a bicycle: Rh‐catalysed asymmetrichydroformylation of a bicycliclactam, 2‐azabicyclo‐[2.2.1]hept‐5‐en‐3‐one, was investigated. The use of a chiral diphosphite ligand, (R,R)‐Kelliphite, enables excellent selectivity towards one regioisomer combined with excellent productivity and perfect exo selectivity. The products are versatile precursors to highly desired functionationalised cyclopentylamines
[EN] HIGHLY SELECTIVE ASYMMETRIC HYDROFORMYLATION OF (1S,4R) OR (1R,4S)-2-AZABICYCLO[2.2.1]HEPT-5-EN-3- ONE (+) OR (-)-LACTAM<br/>[FR] HYDROFORMYLATION ASYMÉTRIQUE EXTRÊMEMENT SÉLECTIVE DE LA (+) OU (-)-LACTAME (1S,4R)- OU (1R,4S)-2-AZABICYCLO[2.2.1]HEPT-5-ÉN-3-ONE
申请人:REDDYS LAB LTD DR
公开号:WO2011150205A2
公开(公告)日:2011-12-01
Methods of producing the compounds of formula (22) and (23) or enantiomers thereof comprising hydroformylation of compounds of the formula (21) or their enantiomers: using Kelliphite as chiral ligand wherein R is -H or an amine-protecting group.
Divergent synthesis of two precursors of 3′-homo-2′-deoxy- and 2′-homo-3′-deoxy-carbocyclic nucleosides
作者:José M Blanco、Franco Fernández、Xerardo Garcı́a-Mera、José E Rodrı́guez-Borges
DOI:10.1016/s0040-4020(02)01053-0
日期:2002.10
synthesis of higher homologues of 2′-deoxy- and 3′-deoxycarbonucleosides, respectively, were efficiently prepared by divergent routes starting from (±)-exo-bicyclo[2.2.1]hept-5-ene-2-carbaldehyde. In the key step, ammonolysis of the common intermediate (±)-(1β,3β,4α)-4-benzoyloxymethyl-1,3-cyclopentanedicarboxylic anhydride and subsequent esterification afford near-equimolar amounts of two easily separable