A novel one-pot, three-component synthesis of N-acyl or N-carbamoyl-alpha-amidosulfides 4 is described. The three-component reaction of aldehydes 1, primary carbamates (or amides) 2 and phenylsulfinic acid (6a) afforded alpha-amidosulfones 7, which after addition of sodium thiolate were in situ transformed into stable alpha-amidosulfides 4 in good to excellent yields. We demonstrated that silver salts
Asymmetric Aminalization via Cation-Binding Catalysis
作者:Sang Yeon Park、Yidong Liu、Joong Suk Oh、Yoo Kyung Kweon、Yong Bok Jeong、Mengying Duan、Yu Tan、Ji-Woong Lee、Hailong Yan、Choong Eui Song
DOI:10.1002/chem.201703800
日期:2018.1.24
Asymmetric cation‐binding catalysis, in principle, can generate “chiral” anionic nucleophiles, where the counter cations are coordinated within chiral environments. Nitrogen nucleophiles are intrinsically basic, therefore, its use as nucleophiles is often challenging and limiting the scope of the reaction. Particularly, a formation of configurationally labile aminal centers with alkyl substituents
Direct Synthesis of Highly Substituted Pyrroles and Dihydropyrroles Using Linear Selective Hydroacylation Reactions
作者:Manjeet K. Majhail、Paul M. Ylioja、Michael C. Willis
DOI:10.1002/chem.201600311
日期:2016.6.1
diphosphine ligands, such as (Cy2 P)2 NMe or bis(diphenylphosphino)methane (dppm), are effective at catalysing the union of aldehydes and propargylic amines to deliver the linear hydroacylation adducts in good yields and with high selectivities. In situ treatment of the hydroacylation adducts with p-TSA triggers a dehydrative cyclisation to provide the corresponding pyrroles. The use of allylic amines, in place
Abstract A synthesis of N‐protected β‐aminomalonates starting from α‐amidosulfones under very mild and simple reaction conditions is described. Treatment of the sulfones with malonate esters in the presence of 2.5 equivalents of potassium carbonate affords the desired products in good yield. A variety of N‐Z and N‐Boc protected aliphatic and aromatic α‐aminosulfones and malonate esters have been successfully
摘要描述了在非常温和和简单的反应条件下,以 α-酰胺砜为原料合成 N 保护的 β-氨基丙二酸酯。在2.5当量碳酸钾存在下用丙二酸酯处理砜以良好收率提供所需产物。多种 N-Z 和 N-Boc 保护的脂肪族和芳香族 α-氨基砜和丙二酸酯已成功用作起始材料。水解伴随着 N 保护的 β-氨基丙二酸酯的脱羧,为获得外消旋 β-氨基酸提供了便利。
A Practical Gold-Catalyzed Route to 4-Substituted Oxazolidin-2-ones fromN-Boc Propargylamines