Photochemical dehydrogenation of 3,4-dihydro-2-pyridones.

نویسندگان

  • Partha Sarathi Sadhu
  • Mettu Ravinder
  • Perepogu Arun Kumar
  • Vaidya Jayathirtha Rao
چکیده

Photochemical dehydrogenation of various substituted 3,4-dihydro-2-pyridones was achieved in a very efficient way by employing 10-15 mol% of photo-induced electron transfer sensitizers like 9-cyanoanthracene, 9-cyanophenanthrene and 1-cyanonaphthalene in presence of molecular oxygen, for the first time.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Light-induced stereospecific intramolecular [2+2]-cycloaddition of atropisomeric 3,4-dihydro-2-pyridones.

Atropisomeric 3,4-dihydro-2-pyridones undergo stereospecific [2+2]-photocycloaddition in solution with high stereoselectivity (ee > 98% and de > 96%) in the product. The chiral transfer during phototransformation was rationalized based on the stability/reactivity of the biradical.

متن کامل

Infrared Assisted Production of 3,4-Dihydro-2(1H)-pyridones in Solvent-Free Conditions

A green approach for the synthesis of a set of ten 4-aryl substituted-5-alcoxy carbonyl-6-methyl-3,4-dihydro-2(1H)-pyridones using Meldrum's acid has been devised, the absence of solvent and the activation with infrared irradiation in addition to a multicomponent protocol are the main reaction conditions. The transformations proceeded with moderated yields (50-75%) with a reasonable reaction ra...

متن کامل

Photophysical and Photochemical Properties of 2,3-Dihydro-4(l H)- quinolinones. Part II. Rates and Mechanism of Primary Processes

Fluorescence quantum yields, singlet lifetimes and triplet yields for 2-methyl-2,3-dihydro4(1 H)-quinolinone and N-methyl-2,3-dihydro-4(l H)-quinolinone were determined as a func­ tion o f temperature. In non-polar solvents, an efficient non-radiative process identified as an indirect singlet —*• triplet transition occurring through S2(n,jr*) was found to depopulate the lowest S 1(7t,7E*) state...

متن کامل

Enantiospecific 6π-photocyclization of atropisomeric α-substituted acrylanilides in the solid-state: role of crystalline confinement on enantiospecificity.

Direct irradiation of optically-pure axially-chiral α-substituted acrylanilides in the crystalline state leads to 3,4-dihydro-2-quinolin-2-one photoproduct with an enantiomeric ratio of 85 : 15 while a racemic mixture of photoproduct is observed in solution.

متن کامل

Synthesis of 8-(5-Aryl-4-Octyl-2-Phenyl-3, 4-Dihydro-2H-Pyrazol- 3-yl)-Octanoic acid ethyl esters via 1, 3-Dipolar Cycloaddition Reaction

Aldehyde phenyl hydrazones 2a-i undergo oxidative dehydrogenation with Chloramine-T to give nitrile imines, which are trapped in situ by ethyl oleate 1 to afford 8-(5-Aryl-4-octyl-2-phenyl-3,4-dihydro-2Hpyrazol-3-yl)-octanoic acid ethyl esters 3a-i in good yield. The structures of the cycloadducts were confirmed by spectral studies and elemental analysis.

متن کامل

ذخیره در منابع من

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

دوره 8 4  شماره 

صفحات  -

تاریخ انتشار 2009