Control of Site of Lithiation of 3-(Aminomethyl)pyridine Derivatives
摘要:
Lithiation of N-(pyridin-3-ylmethyl)pivalamide, tert-butyl N-(pyridin-3-ylmethyl)carbamate, and N,N-dimethyl-N-(pyridin-3-ylmethyl)urea with tert-butyllithium (3 equiv) in anhydrous tetrahydrofuran at -78 degrees C takes place on the nitrogen and on the ring at the 4-position. The dilithium reagents thus obtained react with various electrophiles to give the corresponding substituted derivatives in high yields. On the other hand, regioselective side-chain lithiation occurs with lithium diisopropylamide (3.3 equiv) at -20 to 0 degrees C. A mixture of ring and side-chain substitution products is obtained with n-butyllithium as the lithium reagent. Treatment of one of the ring-substituted products with trifluoroacetic anhydride in dichloromethane under reflux conditions led to formation of the corresponding 1H-pyrrolo[3,4-c]pyridine in high yield.
[EN] DIAZABICYCLOOCTANE DERIVATIVES COMPRISING A QUATERNERY AMMONIUM GROUP FOR USE AS ANTIBACTERIAL AGENTS [FR] DÉRIVÉS DE DIAZABICYCLOOCTANE COMPRENANT UN GROUPE D'AMMONIUM QUATERNAIRE DESTINÉ À ÊTRE UTILISÉ EN TANT QU'AGENTS ANTIBACTÉRIENS
Lithiation of N-(pyridin-3-ylmethyl)pivalamide, tert-butyl N-(pyridin-3-ylmethyl)carbamate, and N,N-dimethyl-N-(pyridin-3-ylmethyl)urea with tert-butyllithium (3 equiv) in anhydrous tetrahydrofuran at -78 degrees C takes place on the nitrogen and on the ring at the 4-position. The dilithium reagents thus obtained react with various electrophiles to give the corresponding substituted derivatives in high yields. On the other hand, regioselective side-chain lithiation occurs with lithium diisopropylamide (3.3 equiv) at -20 to 0 degrees C. A mixture of ring and side-chain substitution products is obtained with n-butyllithium as the lithium reagent. Treatment of one of the ring-substituted products with trifluoroacetic anhydride in dichloromethane under reflux conditions led to formation of the corresponding 1H-pyrrolo[3,4-c]pyridine in high yield.
[EN] DIAZABICYCLOOCTANE DERIVATIVES COMPRISING A QUATERNERY AMMONIUM GROUP FOR USE AS ANTIBACTERIAL AGENTS<br/>[FR] DÉRIVÉS DE DIAZABICYCLOOCTANE COMPRENANT UN GROUPE D'AMMONIUM QUATERNAIRE DESTINÉ À ÊTRE UTILISÉ EN TANT QU'AGENTS ANTIBACTÉRIENS
申请人:WOCKHARDT LTD
公开号:WO2018203194A1
公开(公告)日:2018-11-08
Compounds of Formula (I), pharmaceutical compositions comprising these compounds and their use in treating bacterial infection is disclosed.