Resolution of (±)-anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-ol via Candida cylindracea lipase: synthesis of (−)- and (+)-proto-quercitol
作者:M.Serdar Gültekin、Murat Çelik、Engin Turkut、Cihangir Tanyeli、Metin Balci
DOI:10.1016/j.tetasy.2003.11.037
日期:2004.2
Photooxygenation of cyclohexa-1,4-diene afforded anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-yl hydroperoxide. The hydroperoxy endoperoxide was reduced with dimethylsulfide-titanium tetraisopropoxide to produce ()-anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-ol. The highly efficient enantioselective resolution of the racemic (+/-)-anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-ol was accomplished with Candida cylindracea lipase (CCL) to produce the enantiomerically enriched alcohol and the corresponding acetate: The cleavage of the peroxide linkage by thiourea followed by the oxidation of the double bond with OsO4 resulted in the formation of (-)-proto-quercitol and (+)-proto-quercitol, respectively. (C) 2003 Elsevier Ltd. All rights reserved.