1. Organokatalitička stereoselektivna priprava derivata izoindolinona s triaril-supstituiranim kvaternim stereogenim centrom
- Author
-
Beriša, Arben and Gredičak, Matija
- Subjects
quaternary stereogenic center ,ariliranje ,organokataliza ,PRIRODNE ZNANOSTI. Kemija ,isoindolinone ,NATURAL SCIENCES. Chemistry ,stereoselektivna sinteza ,adicija pirola ,izoindolinoni ,kvaterni stereogeni centar ,regioselektivnost ,regioselectivity ,addition of pyrroles ,organocatalysis ,udc:54(043.3) ,arylation ,Kemija. Kristalografija. Mineralogija ,stereoselective synthesis ,Chemistry. Crystallography. Mineralogy - Abstract
U sklopu ove doktorske radnje razvijen je protokol koji opisuje sintezu derivata izoindolinona s triaril-supstituiranim kvaternim stereogenim centrom u organokatalitičkim uvjetima. Provedeno je stereoselektivno i regioselektivno ariliranje izoindolinona, te aza-Friedel Craftsova adicija pirola kroz položaj C3. Tako opisane transformacije katalizirane kiralnim fosfornim kiselinama uključuju širok raspon različitih nukleofila i izoindolinonskih alkohola za stvaranje kvaternog stereogenog centra s tri arilna supstituenta u odličnim prinosima i razinama enantioselektivnosti (do 98% prinosa, do 99,5:0,5 e.r.). Mehanizam stereokemijske indukcije predložen je na temelju rezultata dobivenih kvantno-mehaničkim računima i kontrolnim eksperimentima. Ispitana je primjenjivost opisanih metodologija provedbom reakcije na većoj skali i posttransformacijskom reakcijom bez gubitka optičke čistoće. An organocatalytic asymmetric protocol for the synthesis of isoindolione derivatives possessing triaryl-substituted quaternary stereogenic centers is developed. Stereoselective and regioselective arylation of isoindolinones with phenols and pyrroles at C3 position has been carried out. Described stereoselective transformations proceed smoothly with a broad range of arenes and isoindolinone alcohols in reactions mediated by chiral phosphoric acid catalyst to generate triaryl-substituted quaternary stereogenic centers in excellent yields and enantioselectivities (up to 98% yield, up to 99,5:0,5 e.r.). In the order to shed light on the mechanism of stereochemical induction, control experiments and density functional theory calculations have been performed. Applicability of such described methodologies has been investigated by conducting the postmodification and scale-up reaction without loss of optical purity in the products.
- Published
- 2022