Toward a Versatile Allylation Reagent: Practical, Enantioselective Allylation of Acylhydrazones Using Strained Silacycles
作者:Richard Berger、Philippe M. A. Rabbat、James L. Leighton
DOI:10.1021/ja035001g
日期:2003.8.1
A highly practical method for the enantioselectiveallylation of acylhydrazones has been developed. The previously reported strained silacycle reagent 1 reacts with a wide variety of acylhydrazones to give the hydrazide products with good enantioselectivity (83-89% ee, typically). It has been demonstrated that the products may be isolated without chromatography by recrystallization in >/=98% ee.
Pyrrolidine and Piperidine Formation via Copper(II) Carboxylate-Promoted Intramolecular Carboamination of Unactivated Olefins: Diastereoselectivity and Mechanism
作者:Eric S. Sherman、Peter H. Fuller、Dhanalakshmi Kasi、Sherry R. Chemler
DOI:10.1021/jo070321u
日期:2007.5.1
olefin substrates examined were more reactive than those with internal olefins, and the latter terminated in elimination rather than carbon−carbonbondformation. The efficiency of the reaction was enhanced by the use of more organic soluble copper(II) carboxylate salts, copper(II) neodecanoate in particular. The reaction times were reduced by the use of microwave heating. High levels of diastereoselectivity
Novel derivatives of enfumafungin are disclosed herein, along with their pharmaceutically acceptable salts, hydrates and prodrugs. Also disclosed are compositions comprising such compounds, methods of preparing such compounds and methods of using such compounds as antifungal agents and/or inhibitors of (l,3)-β-D-glucan synthase. The disclosed compounds, their pharmaceutically acceptable salts, hydrates and prodrugs,,as well as compositions comprising such compounds, salts, hydrates and prodrugs, are useful for treating and/or preventing fungal infections and associated diseases and conditions.
A detailed study of tetrathiomolybdate mediated tandem regio- and stereoselective ring opening of aziridine, disulfide formation, reduction of disulfide bond and Michael reaction in a one-pot operation is reported. This constitutes four reactions that take place in one-pot operation. In the reaction of [BnEt3N]4MoS4 with an aziridine derived from cyclohexene and in the absence of Michael acceptor intermediates
一锅操作中,详细报道了四硫代钼酸盐介导的氮丙啶串联区域和立体选择性开环,二硫键形成,二硫键还原和迈克尔反应的详细研究。这构成了一锅操作中发生的四个反应。在[BnEt 3 N] 4 MoS 4的反应中在不存在迈克尔受体的情况下,用衍生自环己烯的氮丙啶的化合物分离并充分表征了磺酰胺基二硫化物和磺酰胺基硫醇。还已经表明,可以在环氧化物存在下选择性地打开氮丙啶环。通过掺入合适的迈克尔受体作为底物的一部分,可以进行分子内的1,4-加成,以高收率合成含硫的无环环状氨基酸酯衍生物和硫代双环[3.3.1]壬烷衍生物。 。
Chiral 1,3,2-Diazaphospholenes as Catalytic Molecular Hydrides for Enantioselective Conjugate Reductions
作者:Solène Miaskiewicz、John H. Reed、Pavel A. Donets、Caio C. Oliveira、Nicolai Cramer
DOI:10.1002/anie.201801300
日期:2018.4.3
of chiral, conformationally restricted methoxy‐1,3,2‐diazaphospholene catalysts is reported. We demonstrate their catalytic potential in asymmetric 1,4‐reductions of α,β‐unsaturated carbonyl derivatives, including enones, acyl pyrroles, and amides, which proceeded in enantioselectivities of up to 95.5:4.5 e.r.
1,2,3,2-二氮杂二膦烯原子具有极化的PH键,并以分子氢化物形式出现。本文报道了一类手性,构象受限的甲氧基-1,3,2-二氮杂磷腈催化剂。我们证明了它们在α,β-不饱和羰基衍生物(包括烯酮,酰基吡咯和酰胺)的不对称1,4-还原反应中的催化潜能,其对映选择性高达95.5:4.5 er