作者:Krzysztof Z. Łączkowski、Marcin M. Pakulski、Marek P. Krzemiński、Parasuraman Jaisankar、Marek Zaidlewicz
DOI:10.1016/j.tetasy.2008.03.008
日期:2008.4
Asymmetric synthesis of (S)-N-(1-arylethyl)-N-hydroxyureas, (S)-N-(6-methoxy)- and (S)-N-(6-benzyloxy-2,3-dihydrobenzofuran-3-yl)-N-hydroxyurea— lipoxygenase inhibitor, is described. Three approaches to the formation of the N-hydroxyurea moiety at the stereogenic center have been used. The first one, via the reaction of (R)-6-benzyloxy-2,3-dihydrobenzofuran-3-ol with N,O-bis(phenoxycarbonyl)hydroxylamine
(S)-N-(1-芳基乙基)-N-羟基脲,(S)-N-(6-甲氧基)-和(S)-N-(6-苄氧基-2,3-二氢苯并呋喃-3 )的不对称合成描述了(β-基)-N-羟基脲-脂氧合酶抑制剂。已经使用了三种在立体发生中心形成N-羟基脲部分的方法。第一种,通过(R)-6-苄氧基-2,3-二氢苯并呋喃-3-醇与N,O-双(苯氧基羰基)羟胺在Mitsunobu条件下反应,得到部分消旋的产物。或者,肟的对映选择性还原可以控制苯乙酮,4-甲氧基-和4-苄氧基苯乙酮,6-甲氧基-和6-苄氧基-2,3-二氢苯并呋喃-3-酮与硼烷/恶唑硼烷的O-苄基醚生成相应的羟胺O-苄基醚或伯胺,它们已以57%到99%ee转化为N-取代的N-羟基脲。