Tunable stereoselectivity in the addition of 2-lithiothiazole to L-serinal derived N-benzyl nitroe. Synthesis of C-2 epimer 2,3-diamino-4-hydroxybutanals
作者:Alessandro Dondoni、Francisco L. Merchan、Pedro Merino、Tom�s Tejero、Valerio Bertolasi
DOI:10.1039/c39940001731
日期:——
A Complete reversal of distereoselectivity (ds 95%) in the addiition of 2-lithiothiazole to L-serinal derived N-benzylnitrone has been achieved by the change of the hydroxy and amino protective gruops in the aldehyde moiety; the resultant epimeric 2-thiazolyl N-benzyl hydroxylamines were converted to C-2 epimer 2,3-diaminio-4-hydroxybutanals via reductive dehydroxylation and thiazolyl-to-formaly conversion.
通过改变醛基中的羟基和氨基保护基团,实现了2-锂噻唑与L-苯甲基硝基烷基化合物相加时的绝对立体选择性(ds 95%)的完全反转;所得到的互变体2-噻唑基N-苄基氢氧胺经过还原脱羟化和噻唑转化为甲醛,最终转化为C-2互变体2,3-二氨基-4-羟基丁醛。