Highly Diastereoselective Michael Addition Reactions of Butane-2,3-diacetal Desymmetrized Glycolic Acid. Preparation of α-Hydroxy-γ-amino Acid Derivatives
作者:Darren J. Dixon、Steven V. Ley、Félix Rodríguez
DOI:10.1021/ol016708f
日期:2001.11.1
[reaction--see text] The butane-2,3-diacetal (BDA) desymmetrized glycolic acid building block undergoes efficient and highly diastereoselective lithium enolate Michael additions to alpha,beta-unsaturated ketones, lactones, and nitro olefins. Subsequent deprotection of these Michael adducts gives alpha-hydroxy acids in very high yield. Hydrogenation of the nitro group in some of the adducts leads to
[反应-见文字]异丁烷2,3-二缩醛(BDA)乙醇酸结构单元经过高效且高度非对映选择性的烯醇化Michael迈克尔添加到α,β-不饱和酮,内酯和硝基烯烃中。随后这些迈克尔加合物的脱保护以非常高的产率得到α-羟基酸。在某些加合物中硝基的氢化会产生γ-内酰胺,其可以轻松转化为α-羟基-γ-氨基酸衍生物。