Method for synthesizing tetrahydroisoquinoline oxazolidine
申请人:National Chi Nan University
公开号:US10093682B1
公开(公告)日:2018-10-09
The invention relates to a method for synthesizing tetrahydroisoquinoline oxazolidine. The method is carried out at a room temperature between 20° C. and 35° C.
Base‐Promoted [3+3]‐Cycloaddition of γ‐Hydroxy‐α,β‐unsaturated Carbonyls with
<i>N,N′</i>
‐Cyclic Azomethine Imines for Synthesizing Bicyclic Oxadiazines
作者:Sung Hyun Kang、Byung Jun Park、Sung‐Gon Kim
DOI:10.1002/ejoc.202200867
日期:2022.10.7
N,N′-cyclic azomethine imines with γ-hydroxy-α,β-unsaturated carbonyls under metal-free conditions was achieved. Bicyclic oxadiazines were readily obtained in moderate to good yields from the reactions of various γ-hydroxy-α,β-unsaturated ketones, including aromatic and aliphatic ketones, with N,N′-cyclic azomethine imines under mild conditions, demonstrating the broad substrate scope.
Enantioselective synthesis of tetrahydrofuran spirooxindoles <i>via</i> domino oxa-Michael/Michael addition reaction using a bifunctional squaramide catalyst
作者:Khyati Shukla、Khushboo、Pratibha Mahto、Vinod K. Singh
DOI:10.1039/d2ob00633b
日期:——
reaction of γ-hydroxyenones to isatylidene malononitriles, using a cinchona derived bifunctional squaramide catalyst has been developed. The methodology is the first success of enantioselective oxa-Michael addition to isatylidene malononitriles. The spiro products were obtained in excellent yields with moderate to good enantio- and diastereoselectivities. Scale-up of the reaction and synthetic transformation
Organocatalytic Asymmetric [3 + 2]-Annulations of γ-Sulfonamido/γ-Hydroxy-α,β-Unsaturated Ketones with Cyclic <i>N</i>-Sulfimines: Synthesis of Chiral Polyheterotricyclic Imidazolidines and Oxazolidines
作者:Yoseop Kim、Seung Yeon Kim、Sung-Gon Kim
DOI:10.1021/acs.joc.2c02634
日期:2023.1.20
The first organocatalytic asymmetric [3 + 2]-annulation of γ-sulfonamido-α,β-unsaturated ketones with cyclic N-sulfimines has been developed, and enantioenriched functionalized polyheterotricyclic imidazolidines were obtained in good yields and with excellent enantioselectivities. This approach was also extended to the asymmetric [3 + 2]-annulation of γ-hydroxy-α,β-unsaturated ketones, affording enantioenriched
Base‐catalyzed [3 + 2]/[4 + 2]‐annulations of cyclic <scp><i>N</i></scp>‐sulfimines with γ‐ and δ‐sulfonamido/hydroxy‐α,β‐unsaturated carbonyls: Stereoselective synthesis of imidazolidines, oxazolidines, hexahydropyrimidines, and 1,3‐oxazinanes
作者:Yoseop Kim、Seung Yeon Kim、Sung‐Gon Kim
DOI:10.1002/bkcs.12702
日期:2023.7
β-unsaturated carbonyl compounds, catalyzed by Et3N, has been successfully applied for the synthesis of stereoselective hexahydropyrimidines. Furthermore, the base-catalyzed annulation of cyclic N-sulfimines with γ- and δ-hydroxy-α,β-unsaturated carbonyl compounds has proven to be a reliable method for the synthesis of oxazolines and 1,3-oxazinanes.
建立了一种通过环状N-亚磺胺的[3+2]环化制备咪唑烷衍生物的高效、简单的合成方法。该反应涉及环状N-亚磺胺与γ-磺酰胺基-α,β-不饱和羰基化合物的反应,Cs 2 CO 3为催化剂。结果是产生了多种具有显着产率和立体选择性的咪唑烷衍生物。此外,在Et 3催化下,环状N-亚磺胺与δ-磺酰胺基-α,β-不饱和羰基化合物之间发生[4 + 2]-成环反应。N,已成功应用于立体选择性六氢嘧啶的合成。此外,环状N-亚磺胺与γ-和δ-羟基-α,β-不饱和羰基化合物的碱催化成环已被证明是合成恶唑啉和1,3-恶嗪烷的可靠方法。