β-Hydroxy-α-tosyloxy esters as chiral building blocks for the enantioselective synthesis of benzo-annulated oxa-heterocycles: scope and limitations
作者:Sajal Kumar Das、Gautam Panda
DOI:10.1016/j.tet.2008.03.001
日期:2008.5
The enantioselective synthesis of benzo-annulated oxa-heterocycles 2,3-dihydrobenzofuran and 1-benzopyran derivatives is described using β-hydroxy-α-tosyloxy esters as chiral building blocks, which are easily accessible through the regioselective α-tosylation of Sharpless asymmetric dihydroxylation-derived syn-2,3-dihydroxy esters.
使用β-羟基-α-甲苯磺酰氧基酯作为手性结构单元描述了苯并环的氧杂杂环2,3-二氢苯并呋喃和1-苯并吡喃衍生物的对映选择性合成,可通过Sharpless不对称二羟基化的区域选择性α-甲苯磺酸化轻松实现衍生的顺-2,3-二羟基酯。