Transition metal catalyzed carboannulation of diazabicyclic alkenes with ambiphilic bifunctional reagents: a facile route towards functionalized indanones and indanols
yields by the Pd/Rh catalyzed carboannulation of bicyclic and tricyclic hydrazines with 2-iodobenzonitrile, 2-cyanophenylboronic acid and 2-formylphenylboronic acid. The reaction with 2-formylphenylboronic acid afforded 3,4-disubstituted cyclopentenes as minor product along with indanones under Rh catalyzed conditions, whereas indanols were obtained as the major product under Pd catalyzed conditions. The
Iodine assisted palladium catalyzed ring opening of bicyclic hydrazines with organoboronic acids: stereoselective synthesis of functionalized cyclopentenes and alkylidene cyclopentenes
作者:S. Anas、Jubi John、V. S. Sajisha、Joshni John、Rani Rajan、E. Suresh、K. V. Radhakrishnan
DOI:10.1039/b714921b
日期:——
A novel reactivity of organoboronic acids with bicyclic hydrazines leading to the stereoselective formation of trans-vicinal disubstituted cyclopentenes in good to excellent yield is discussed. The reaction of cyclopentadiene and fulvene derived azabicyclic alkenes with organoboronic acids afforded the trans-3,4-disubstituted cyclopentenes and alkylidene cyclopentenes in good to excellent yields. The products, having a broad range of substituents, are important intermediates in the synthesis of a number of pharmaceutically important molecules.
Palladium/Lewis Acid-Catalyzed Reactions of Bicyclic Hydrazines with Organostannanes: A General Methodology for the Stereoselective Synthesis of 3,4-Disubstituted Cyclopentenes
作者:V. S. Sajisha、K. V. Radhakrishnan
DOI:10.1002/adsc.200505488
日期:2006.5
Pd/Lewisacid-catalyzedreactions of bicyclichydrazines with organostannanes afforded the 3,4-disubstitutedcyclopentenes in excellent yields. The reaction is milder and is the first generalmethodology developed for the stereoselectivesynthesis of trans, vicinal disubstituted cyclopentenes. The results show that organostannanes with easily functionalizable moieties can be efficiently utilized in
meso‐Hydrazines could be desymmetrised by ring‐opening reactions by using various metal catalysts to form substituted cyclopentenes, which have a high synthetic potential. Herein, we report the asymmetric copper‐catalysed ringopening of a range of polycyclic hydrazines with trialkylaluminiumreagents and SimplePhosligands with both high isolated yields and enantioselectivities of up to 95 %.
Iodine assisted modified Suzuki type reaction of bicyclic hydrazines: stereoselective synthesis of functionalized cyclopentenes
作者:Jubi John、V. S. Sajisha、Smitha Mohanlal、K. V. Radhakrishnan
DOI:10.1039/b607389a
日期:——
Bicyclic hydrazines undergo a facile palladium/iodine mediated stereoselective ring opening on reaction with organoboronic acids affording trans-3,4-disubstituted hydrazino cyclopentenes in good to excellent yield.