Influence of
<i>N</i>
‐Substitution in 3‐Alkyl‐3‐hydroxyisoindolin‐1‐ones on the Stereoselectivity of Brønsted Acid‐Catalyzed Synthesis of 3‐Methyleneisoindolin‐1‐ones
作者:Nikola Topolovčan、Filip Duplić、Matija Gredičak
DOI:10.1002/ejoc.202100400
日期:2021.7.26
Brønsted acid-catalyzed dehydration of 3-alkyl-3-hydroxyisoindolin-1-ones is discussed. The reaction is efficiently catalyzed by methanesulfonic acid in acetonitrile and provides the corresponding 3-methyleneisoindolin-1-ones. The E/Z stereochemistry around the exocyclic double bond is in strong correlation with the size of the N-substituent. Selective formation of only one stereoisomer can be controlled
Asymmetricaddition of indoles to cyclic α-diaryl-substituted N-acyl imines, which are generated in situ from 3-aryl 3-hydroxyisoindolinones, is described. The transformation proceeds smoothly with a broad range of indoles and isoindolinone alcohols using a SPINOL-derived chiral Brønsted acid catalyst to afford α-tetrasubstituted (3-indolyl)(diaryl)methanamines in excellent yields and enantioselectivities
Corrigendum to: Continuous-Flow Photochemical Transformations of 1,4-Naphthoquinones and Phthalimides in a Concentrating Solar Trough Reactor
作者:Madyan A. Yaseen、Saira Mumtaz、Richard L. Hunter、Daniel Wall、Mark J. Robertson、Michael Oelgemöller
DOI:10.1071/ch20138_co
日期:——
photochemical transformations has been successfully conducted under continuous-flow conditions in a concentrating solar trough reactor. Photoacylations and [2+2]-photocycloadditions involving 1,4-naphthoquinones gave the corresponding photoproducts in moderate to high yields with residence times of 70min. Likewise, acetone-sensitized photodecarboxylations involving phthalimides furnished the corresponding
Enantioselective Hydrophosphonylation of <i>in Situ</i> Generated <i>N</i>-Acyl Ketimines Catalyzed by BINOL-Derived Phosphoric Acid
作者:Arun Suneja、Rajshekhar A. Unhale、Vinod K. Singh
DOI:10.1021/acs.orglett.6b03623
日期:2017.2.3
An efficient route to pharmacologically interesting isoindolinone-based α-amino phosphonates is described via asymmetric hydrophosphonylation of in situ generated ketimines catalyzed by BINOL-derivedphosphoricacid. The reaction proceeds smoothly at ambient temperature affording a variety of α-amino phosphonates with a quaternary stereogenic center embedded in isoindolinone motif in high yields with
Asymmetric hydrogenolysis of racemic tertiary alcohols, 3-substituted 3-hydroxyisoindolin-1-ones, was developed using chiral phosphoric acid as catalyst and a Hantzsch ester as the hydrogen source with up to 95% ee. The reaction process of this asymmetric transfer hydrogenation may occur directly through the acyliminium ion intermediate.
使用手性磷酸作为催化剂和 Hantzsch 酯作为氢源开发了外消旋叔醇(3-取代的 3-羟基异吲哚啉-1-酮)的不对称氢解,其 ee 高达 95%。这种不对称转移氢化的反应过程可以直接通过酰亚胺离子中间体发生。