Stereoselective nucleophilic substitution of 6-(tert-butyldimethylsilyloxy)-3,6-dihydro-2H-pyran-3-yl acetate: application to the synthesis of a NK1 receptor antagonist
作者:Kazutoshi Sugawara、Tomiki Hashiyama
DOI:10.1016/j.tetlet.2007.03.104
日期:2007.5
Reaction of chiral cis- and trans-6-(tert-butyldimethylsilyloxy)-3,6-dihydro-2H-pyran-3-yl acetates with various nucleophiles (allyltrimethylsilane, bistrimethylsilylacetylene, benzyl alcohol, benzyl carbamate etc.) in the presence of a Lewis acid gave the corresponding 2,3-unsaturated pyran derivatives in good to excellent yield with trans selectivity. Application to the synthesis of NK1 antagonist
手性的反应顺式-和反式-6-(叔-butyldimethylsilyloxy)-3,6-二氢-2 H ^ -吡喃-3-基乙酸酯在存在各种亲核(烯丙基三甲基硅烷,bistrimethylsilylacetylene,苄醇,苄基氨基甲酸叔丁酯等)路易斯酸的生成,以反式选择性好至极好产率得到相应的2,3-不饱和吡喃衍生物。还描述了在NK 1拮抗剂的合成中的应用。