Asymmetric One-Pot Synthesis of 1,4-Dihydroquinolines via an Organocatalytic Aza-Michael/Michael Cascade Strategy
作者:Yona Lee、Seungpyeong Heo、Sung-Gon Kim
DOI:10.1002/adsc.201401176
日期:2015.5.4
A synthetic method for the construction of fully substituted enantioenriched 1,4‐dihydroquinolines using an organocatalytic aza‐Michael/Michael cascadereaction has been developed. The asymmetricreaction of 2‐(tosylamino)phenyl α,β‐unsaturated ketones with alkynyl aldehydes, promoted by diphenylprolinol O‐TMS ether as an organocatalyst, generated chiral 1,4‐dihydroquinolines in good to high yields
Synthesis of methylene cyclopropane-fused chromenes and dihydroquinolines by sequential [4 + 2]- and [1 + 2]-annulation
作者:Tianyu Lu、Xuange Zhang、Zhiwei Miao
DOI:10.1039/d0ob00389a
日期:——
A base promoted sequential [4 + 2]- and [1 + 2]-annulation of 2-hydroxychalcones or 2-tosylaminochalcones with prop-2-ynylsulfonium salts has been developed to give the corresponding methylene cyclopropane fused dihydroquinolines or chromenes in moderate to good yields. This transformation has advantage of wide substrate scope and functional group tolerance as well as excellent regioselectivity. Prop-2-ynylsulfonium
Reusable Supported Pyridine-Mediated Cascade Synthesis of <i>trans</i>-2,3-Dihydroindoles via In Situ-Generated <i>N</i>-Ylide
作者:Anshul Jain、Anitta Regina、Akanksha Kumari、Ranjan Patra、Manikandan Paranjothy、Nirmal K. Rana
DOI:10.1021/acs.orglett.3c01295
日期:2023.5.26
Merrifield resin-anchored pyridines were prepared and applied as reusable mediators for trans-selective cascade synthesis of 2,3-dihydroindoles. The developed approach relied on in situ N-ylide formation followed by Michael substitution reactions. The cascade reaction was also carried out efficiently with simple pyridine. The products were further transformed into synthetically valuable compounds,
Organocatalytic Enantioselective Cascade Aza‐Michael/Michael Addition for the Synthesis of Highly Functionalized Tetrahydroquinolines and Tetrahydrochromanoquinolines
作者:Wen Yang、Hai‐Xiao He、Yu Gao、Da‐Ming Du
DOI:10.1002/adsc.201300670
日期:2013.12.16
AbstractAn efficient organocatalytic highly asymmetric cascade aza‐Michael/Michael addition reaction for the synthesis of tetrahydroquinolines and tetrahydrochromanoquinolines has been developed. This cascade reaction proceeds well at low catalyst loading with a broad substrate scope, furnishing the desired products in excellent yields with excellent diastereoselectivities and enantioselectivities (up to >99:1 dr, 99% ee) under mild conditions. Importantly, it is the first catalytic asymmetric method for tetrahydrochromanoquinolines. This protocol provides a straightforward entry to highly functionalized chiral tetrahydroquinoline and tetrahydrochromanoquinoline derivatives from simple starting materials.magnified image
One-Pot Synthesis of Functionalized 2,3-Disubstituted Indolines via K<sub>2</sub>CO<sub>3</sub>-Promoted Cascade Michael/Aza-Cyclization Reactions