Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye
Tezin Onay Tarihi: 2010
Tezin Dili: İngilizce
Öğrenci: Merve Çayır
Danışman: CİHANGİR TANYELİ
Özet:The main subject of this thesis is synthesis of chiral diene systems via Ring Closing Enyne Metathesis (RCEM). Furan and thiophene carbaldehydes were chosen as starting compounds. As a result of allylation and propargylation reaction of these aldehydes targeting racemic heteroaryl substituted homoallylic and homopropargylic alcohols were synthesized. Enantiomerically enriched alcohols were obtained by enzymatic resolution method with different enzymes (PS-II, Lipozyme) with the high enantiomeric excess values. Absolute configurations of all alcohols are known. O-allylation and O-propargylation reactions of enantiomerically pure alcohols, afforded feasible enyne units for RCEM were synthesized successfully. All RCEM reactions were performed by using Grubbs‟ 1st generation catalyst. The absolute configuration of all chiral diene systems were known since during the course of the all reactions, configurations were preserved. As a last step, Diels-Alder reactions were applied to some of these chiral diene systems to get bicyclic compounds and comment on the stereoselectivity. Only one diastereomeric cycloadduct was observed as a result of Diels-Alder applications.