Stereoselective synthesis of alcohols. Part LV. Domino hydroformylation-allylboration-hydroformylation reactions to give trans-perhydropyrano[3,2-b]pyridine derivatives
作者:Reinhard W. Hoffmann、David Brückner
DOI:10.1039/b009259m
日期:——
N-Allyl-(E)-γ-aminoallyl boronates 8 and 18, when subjected to hydroformylation conditions, enter into a domino hydroformylation-allylboration-hydroformylation reaction cascade to generate the bicyclic N,O-heterocycles 12 and 20. On reaction
of the methallyl compound 8b a stereogenic center is generated in the initial hydroformylation, which
controls the relative configuration
of the two new stereogenic centers resulting from the allylboration reaction.
N-烯丙基-(E)-γ-氨基烯丙基硼酸盐8和18,在氢甲酰化条件下,进入多米诺氢甲酰化-烯丙基硼化-氢甲酰化反应级联,生成双环N,O-杂环12和20。在甲基烯丙基化合物8b反应时,初始氢甲酰化过程中生成一个手性中心,控制烯丙基硼化反应产生的两个新手性中心的相对构型。