作者:Hillary J. Dequina、Josephine Eshon、William T. Raskopf、Israel Fernández、Jennifer M. Schomaker
DOI:10.1021/acs.orglett.0c01124
日期:2020.5.1
products, but traditional methods do not typically introduce stereochemical complexity into the ring. To expand access to these scaffolds, we report Rh-catalyzed ring expansions of aziridines and N-sulfonyl-1,2,3-triazoles to furnish dehydropiperazines with excellent diastereocontrol. Productive ring expansion proceeds via a pseudo-1,4-sigmatropic rearrangement of an aziridinium ylide species. However
哌嗪广泛存在于药物和天然产物中,但传统方法通常不会在环中引入立体化学复杂性。为了扩大这些支架的使用范围,我们报道了 Rh 催化的氮丙啶和 N-磺酰基-1,2,3-三唑的扩环,为脱氢哌嗪提供了优异的非对映控制。通过氮丙啶叶立德物种的伪 1,4-σ 重排进行有效的环扩展。然而,卡宾前体的结构特征很重要,因为吡啶并三唑经历竞争性螯合挤出以提供酮亚胺。