作者:Barry B. Snider、Qing Lu
DOI:10.1080/00397919708006097
日期:1997.5
(+/-)-Raikovenal (1a) has been synthesized in five steps from dihydrofilifolone (3) by two Wittig reactions. A similar sequence provides (+/-)-preraikovenal Epiraikovenal (1b) has been prepared by photolysis of preraikovenal or by photolysis of 5 to give 4b. Lewis acid induced cyclization of enal 5 gives cyclopentylideneacetaldehyde 16 rather than bicyclo[3.2.0]heptanecarboxaldehyde 4.
(±)-RaiKovenal(1a)由dihydrofilifolone(3)经过五步反应合成,包括两次Wittig反应。类似的反应序列提供了(±)-preraikovenal。Epiraikovenal(1b)通过preraikovenal的光解或通过5号物质的光解制备得到。烯醛5在Lewis酸诱导下发生环化,生成cyclopentylideneacetaldehyde 16,而不是bicyclo[3.2.0]heptanecarboxaldehyde 4。