Diastereoselective Additions of Nucleophiles to α-Acetoxy Ethers Using the α-(Trimethylsilyl)benzyl Auxiliary
作者:Scott D. Rychnovsky、Jennifer Cossrow
DOI:10.1021/ol0347904
日期:2003.6.1
the diastereoselective addition of a variety of nucleophiles to alpha-(trimethylsilyl)benzyl-substituted oxocarbenium ions. The oxocarbenium ions are generated from alpha-acetoxy ethers, which are easily prepared via reductive acetylation of esters. The alpha-(trimethylsilyl)benzyl auxiliary produces good to excellent facial selectivity with a variety of nucleophiles, including silyl enol ethers, silyl
我们报告了非对映选择性的各种亲核试剂添加到α-(三甲基甲硅烷基)苄基取代的氧碳鎓离子上。氧碳鎓离子由α-乙酰氧基醚生成,可通过酯的还原乙酰化轻松制备。α-(三甲基甲硅烷基)苄基助剂可与多种亲核试剂(包括甲硅烷基烯醇醚,甲硅烷基乙烯酮缩醛,烯丙基硅烷和巴豆基硅烷)产生良好或优异的面部选择性。在复杂的酮醛醇醛偶联反应中进一步证明了该助剂的效用。[反应:看文字]