Diastereoselectivity of Azido-Ugi Reaction with Secondary Amines. Stereoselective Synthesis of Tetrazole Derivatives
作者:Danil P. Zarezin、Victor N. Khrustalev、Valentine G. Nenajdenko
DOI:10.1021/acs.joc.7b00611
日期:2017.6.16
diastereoselectivity of azido-Ugi reaction with cyclic amines was investigated. It was found that the reaction with α-substituted five- to seven-membered cyclic amines proceeds very efficiently to provide high control of diastereoselectivity (≤100% de) under mild conditions. Target tetrazole-derived products were isolated in excellent yields (≤98%). The reaction has a broad scope in terms of its amine, aldehyde, and
研究了叠氮基-Ugi与环胺的非对映选择性。发现与α-取代的五元至七元环胺的反应非常有效地进行,以在温和的条件下高度控制非对映选择性(≤100%de)。分离出目标四唑衍生产品,收率极高(≤98%)。就胺,醛和异氰酸酯的性质而言,该反应具有广泛的范围。发现反应的非对映选择性取决于起始环胺的环大小。刚性更高的哌啶提供最高的反应选择性。使用苄基异氰化物,可以通过氢解将制备的N-苄基四唑脱保护以形成相应的NH四唑。