Synthesis ( IF 2.2 ) Pub Date : 2018-03-27 , DOI: 10.1055/s-0037-1609343 In-Soo Myeong 1 , Jin-Seok Kim 1 , Muyng-Gyu Park 1 , Hwan-Hee Jeon 1 , Changyoung Jung 1 , Yong-Taek Lee 1 , Won-Hun Ham 1
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Abstract
The stereoselective allylations of β-amino-α-hydroxy aldehydes are described. Several Lewis acids (BF3·OEt2, SnCl4, TiCl4, ZnCl2, and MgBr2·OEt2) were utilized in the allylations. The allylation of anti-β-NHCbz-α-OTBS substrate mediated by SnCl4 afforded the syn-selective product, while its allylation mediated by BF3·OEt2 afforded the anti-selective product. The allylation of syn-β-NHCbz-α-OTBS mediated by SnCl4 afforded the anti-selective product. The mechanism involves the chelation between the amido group and aldehyde oxygen by SnCl4, and the Felkin–Anh model by BF3·OEt2. The resulting allylation products were used for the total syntheses of tetraacetyl d-lyxo-, d-ribo-, and d-arabino-phytosphingosines.
The stereoselective allylations of β-amino-α-hydroxy aldehydes are described. Several Lewis acids (BF3·OEt2, SnCl4, TiCl4, ZnCl2, and MgBr2·OEt2) were utilized in the allylations. The allylation of anti-β-NHCbz-α-OTBS substrate mediated by SnCl4 afforded the syn-selective product, while its allylation mediated by BF3·OEt2 afforded the anti-selective product. The allylation of syn-β-NHCbz-α-OTBS mediated by SnCl4 afforded the anti-selective product. The mechanism involves the chelation between the amido group and aldehyde oxygen by SnCl4, and the Felkin–Anh model by BF3·OEt2. The resulting allylation products were used for the total syntheses of tetraacetyl d-lyxo-, d-ribo-, and d-arabino-phytosphingosines.
中文翻译：
线性和手性β-氨基-α-羟基醛的立体选择性烯丙基化：四乙酰基d-lyxo-，d-ribo-和d-阿拉伯糖基-鞘氨醇的总合成
摘要
描述了β-氨基-α-羟基醛的立体选择性烯丙基化。在烯丙基化中使用了几种路易斯酸（BF 3 ·OEt 2，SnCl 4，TiCl 4，ZnCl 2和MgBr 2 · OEt 2 ）。SnCl 4介导的抗-β-NHCbz-α-OTBS底物的烯丙基化提供了顺选择性产物，而BF 3 ·OEt 2介导的其烯丙基化则提供了抗选择性产物。的烯丙基化顺通过介导的SnCl-β-NHCbz的制备-α-OTBS 4得到的反-选择性产品。其机理涉及SnCl 4酰胺基与醛氧的螯合，以及BF 3 ·OEt 2的Felkin-Anh模型。将得到的烯丙基化产物用于四乙酰基的总合成d - L-来苏- ， - d -核糖- ，和d -阿拉伯-phytosphingosines。
描述了β-氨基-α-羟基醛的立体选择性烯丙基化。在烯丙基化中使用了几种路易斯酸（BF 3 ·OEt 2，SnCl 4，TiCl 4，ZnCl 2和MgBr 2 · OEt 2 ）。SnCl 4介导的抗-β-NHCbz-α-OTBS底物的烯丙基化提供了顺选择性产物，而BF 3 ·OEt 2介导的其烯丙基化则提供了抗选择性产物。的烯丙基化顺通过介导的SnCl-β-NHCbz的制备-α-OTBS 4得到的反-选择性产品。其机理涉及SnCl 4酰胺基与醛氧的螯合，以及BF 3 ·OEt 2的Felkin-Anh模型。将得到的烯丙基化产物用于四乙酰基的总合成d - L-来苏- ， - d -核糖- ，和d -阿拉伯-phytosphingosines。
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