Utilization of a 1,2-Dioxine for the Synthesis of the Four Possible Stereoisomers of Oak Lactone
作者:Rachel C. Brown、Dennis K. Taylor、Gordon M. Elsey
DOI:10.1021/ol052754u
日期:2006.2.1
products cis- and trans-oak lactone (1) have been prepared, along with their enantiomeric counterparts, from furanone 12, which was itself prepared from racemic 1,2-dioxine 9 and a chiral malonate diester. The key steps in the synthesis of 1 are the use of the malonate diester as a chromatographic resolving agent and the decarboxylation of 13, which can be directed to give either the cis- or trans-product
[反应:请参见文字]。天然产物顺式和反式内酯(1)以及它们的对映体对应物是由呋喃酮12制备的,而呋喃酮12本身是由外消旋1,2-二恶英9和手性丙二酸二酯制备的。合成1的关键步骤是使用丙二酸酯二酯作为色谱分离剂,以及13的脱羧反应,可以直接制得顺式或反式产物。这导致从共同的中间体产生所有四种可能的橡木内酯立体异构体。