- 作者: 周德璋 ; 劉竟安 ; 林振東
- 作者服務機構: 成功大學化學系
- 中文摘要: Diels-Alder cycloadditions of 1,3-cyclohexadiene and cyclopentadiene to .pi.-facially dissymmetric 5,8-ethano- 5,8-dihydro-1,4-naphthoquinone (1) were examined. The stereochemical outcome of the reactions, determined by a combination of chemical and spectral methods, indicates that addition of cyclic dienes to (1) occurs preferentially at the face syn to the etheno-bridge of (1). Cycloadducts(7a/7b) and (8a/8b) obtained from Diels-Alder reactions of(1) with cyclopentadiene and 1,3-cyclohexadiene undergo [ 2+2 ] -photocyclization to give caged compounds. Stereoselective reduction of the enedione double bond in(7a/7b) and (8a/8b) with aqueous TiCl/sub 3/ in acetone affords cis-bis-bicyclic ring-fused 1,4-cyclo-hexadiones.
- 英文摘要: --
- 中文關鍵字: Diels-Alder Reaction; Cyclic Diene; Stereochemistry; Stereoselective Reduction
- 英文關鍵字: Diels-Alder反應;環二烯;立體化學;立體選擇還原