作者:H. Gerlach、W. Müller
DOI:10.1002/hlca.19720550702
日期:1972.11.1
Two new syntheses of spiro[4.4]nonane-1, 6-dione (I) are described: one by rearrangement of 1,6-epoxy-bicyclo[4.3.0]-nonane-2-one (IV) with boron trifluoride, the other by an acid catalyzed, intramolecular Claisen condensation of 4-(2-oxocyclopentyl)-butyric acid. Spiro[4.4]-nonane-1,6-dione is converted into trans, trans-spiro[4.4]nonane-1,6-diol which is resolved into enantiomers via the diastereomeric
描述了螺[4.4]壬烷-1,6-二酮(I)的两种新合成方法:一种是将1,6-环氧-双环[4.3.0]-壬烷-2-酮(IV)与三氟化硼重排,另一种是通过酸催化的4-(2-氧代环戊基)-丁酸的分子内克莱森缩合反应。将螺[4.4] -壬烷-1,6-二酮转化为反式,反-螺-[4.4]壬烷-1,6-二元醇,通过与(-)-樟脑酸的非对映体酯拆分为对映体。(+)-(5 S)-Spiro [4.4] nona-1,6-diene(III)由(1 R,6 R)-反式,反式-螺环[4.4] nonane-1,6-二醇( II)通过热解相应的双-4-甲基苯基-硫代碳酸酯。楚加耶夫的这种修改该反应对于不能被转化为S-间甲基黄原酸酯的空间位阻醇特别有用。讨论了旋光的螺[4.4]-壬烷-1,6-二烯的圆二色性,UV-和NMR谱。