Stereoselective Synthesis of Hexahydroisobenzofuran-4(1H)-ones from Chiral Substituted Cyclohex-2-enyl Carbamates via Asymmetric Homoaldol Reaction and THF Cyclocondensation
作者:Jochen Becker、Roland Fröhlich、Olga Kataeva、Dieter Hoppe
DOI:10.1002/ejoc.200700220
日期:2007.7
acid-mediated cyclocondensation with aldehydes. Analogous cis,trans,cis-substituted hexahydroisobenzofuran-4(1H)-ones, the core structure of many biologically active natural products, were synthesized starting from anti-configured homoaldol products. The configurations of the products were determined by 1H NMR coupling constants, nOe-studies, and X-ray crystal structure analysis. (© Wiley-VCH Verlag GmbH &
金属化取代的环己-2-烯基氨基甲酸酯与醛的高羟醛反应的非对映选择性受金属配合物的性质控制。烯丙基锂产生同构的产物,而金属转移到 Ti(NEt2)3 可以得到反构型的 3-(1-羟烷基) 环己烯。通过路易斯酸介导的与醛的环缩合反应,将顺式构型的高羟醛产物转化为环化的全顺式四氢呋喃。类似的 cis, trans, cis 取代的六氢异苯并呋喃-4(1H)-ones 是许多具有生物活性的天然产物的核心结构,从反构型的 homoaldol 产物开始合成。产物的构型由 1 H NMR 耦合常数、nOe 研究和 X 射线晶体结构分析确定。(© Wiley-VCH Verlag GmbH & Co. KGaA,