Investigation on Lewis Acid Mediated Diels−Alder Reactions of 2-Phosphono-2-alkenoates. Application to Total Synthesis of (±)-α-Alasken-8-one via Reductive Alkylation of Resulting Adduct
作者:Chuan-Cheng Liao、Jia-Liang Zhu
DOI:10.1021/jo9017292
日期:2009.10.16
-enoate (3) have been investigated. Of several Lewis acids tested, tin(IV) chloride was shown to be the most effective at enhancing the regio- and stereoselectivity of the reactions of 1 with the electron-rich dienes to result in the formation of the single regio- and/or stereoisomers in good yields. Bearing the β methyl group(s), 2 displayed much less reactivity than 1 while 3 was completely unreactive