LiAlH4-Induced Reductive Dephosphonylation of α,α-Dialkyl Triethyl β-Phosphonyl Esters: Mechanistic Study and Synthetic Application
作者:Jia-Liang Zhu、Jr-Sheng Bau、You-Cheng Shih
DOI:10.1055/s-0031-1290485
日期:2012.4
Treatment of α,α-dialkyl triethyl β-phosphonyl esters with LiAlH 4 in CH 2 Cl 2 –THF caused the one-pot dephosphonylation and reduction to yield the corresponding primary alcohols bearing a controllable β secondary carbon center. Mechanisticstudy has revealed that the LiAlH 4 -induced dephosphonylation should occur first with the assistance of the carboxylate group, and the hydrogen source of the
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