氮杂硫 ( VI ) 化合物,如亚磺酰亚胺和磺酰亚胺,由于 S 的独特性质而颇具吸引力。 N键。虽然这些碳连接的磺酰亚氨基衍生物的合成已经很成熟,但其杂原子结合的对应物的情况却有所不同。在这项工作中,我们建议将氮杂硫( IV )酯作为平台化学品,可以对其进行衍生以获得所有类型的 S VI N 官能团,其中包括难以接近的全杂原子亚氨基硫酸酯。使用此处建立的氯胺化工作流程,含有 S-S 键的结构(例如元素硫或二芳基二硫化物)可以转化为亚胺硫酰氯或亚磺酰亚胺酰氯,它们很容易酯化或酰胺化。因此,氯胺作为一种多功能的 [N] 和 [Cl + ] 来源,通过在此处报告的背景下使用它们,我们推进了一套温和的合成方法作为最新的工具箱成员,以涵盖更多的氮杂硫( IV ) ( VI )化学空间。
过渡金属催化的对映选择性氮宾转移到硫化物已成为快速构建对映体富集的硫酰亚胺的最有力的策略之一。然而,与贵金属相比,实现对地球丰富的高活性过渡金属氮烯中间体的立体控制仍然是一个艰巨的挑战。在此,我们公开了使用亚氨基碘烷作为氮宾前体的手性铁(II)/ N , N'-二氧化物催化的二烷基硫醚和烷基芳基硫醚的对映选择性酰亚胺化。以中等至良好的收率和高对映选择性获得了一系列手性磺酰亚胺(56 个实例,收率高达 99%,98:2 er)。通过复杂分子的后期修饰以及手性杀虫剂氟啶虫胺和相关生物活性化合物中间体的合成,证明了该方法的实用性。基于实验研究和理论计算,水键合的高自旋铁氮化物被确定为关键中间体。观察到的立体选择性源于手性洞穴中配体的酰胺单元与硫化物的大取代基之间的空间排斥。此外,二恶唑酮被证明是在铁(III)/ N , N'-二氧化物络合物存在下合适的酰基氮烯前体,导致形成对映选择性反转的硫酰亚
Asymmetric Enzymatic Synthesis of Allylic Amines: A Sigmatropic Rearrangement Strategy
作者:Christopher K. Prier、Todd K. Hyster、Christopher C. Farwell、Audrey Huang、Frances H. Arnold
DOI:10.1002/anie.201601056
日期:2016.4.4
Sigmatropic rearrangements, while rare in biology, offer opportunities for the efficient and selective synthesis of complex chemical motifs. A “P411” serine‐ligated variant of cytochrome P450BM3 has been engineered to initiate a sulfimidation/[2,3]‐sigmatropic rearrangement sequence in whole E. coli cells, a non‐natural function for any enzyme, providing access to enantioenriched, protected allylic amines
申请人:Board of Regents, The University of Texas System
公开号:US20160229778A1
公开(公告)日:2016-08-11
Disclosed is a method for the β-C—H H functionalization of carbonyl compounds that is both selective and broadly applicable. The methods provide direct β-arylation of carbonyl compound with a diverse array of aryl or heteroaryl halides, aryl or heteroryl tosylate, aryl or heteroaryl triflates, or diaryliodonium salts, by palladium catalysis in the presence of a ligand and promoter.
Enantioselective Nitrene Transfer to Sulfides Catalyzed by a Chiral Iron Complex
作者:Jun Wang、Marcus Frings、Carsten Bolm
DOI:10.1002/anie.201304451
日期:2013.8.12
Iron works: Enantioselectivenitrenetransfer to sulfide was accomplished by a chiraliron(III)/PyBOX catalyst (see scheme). Various sulfimides were thus obtained in high enantioselectivities and yields. Applications of this protocol to the syntheses of enantioenriched sulfoximines and an epoxide were also demonstrated.
A convenient preparation of N- (arenesulfonyl) sulfoximines by oxidation of N- (arenesulfonyl) sulfilimines with sodium hypochlorite in a two phase system
N-(Arenesulfonyl) sulfilimines can be oxidized to the corresponding sulfoximes in high yields with sodium hypochlorite in an AcOEt-H2O two phase system in the presence of quaternary ammonium salts as catalysts.
Reduction of semipolar sulphur linkages with carbodithioic acids and addition of carbodithioic acids to olefins
作者:S. Oae、T. Yagihara、T. Okabe
DOI:10.1016/s0040-4020(01)93661-0
日期:1972.1
Carbodithioic acids react with trivalent sulphur compounds bearing semipolarlinkages (sulphoxides, sulphonium ylides and sulphilimines), to give the corresponding sulphides and add to olefins to afford dithioesters. The orientation of olefin addition is controlled by the olefin nature. Michael type addition takes place with olefins bearing an electron-withdrawing group α to the double bond while Markownikoff