Total Synthesis of Aspidosperma and Strychnos Alkaloids through Indole Dearomatization

JM Saya, E Ruijter, RVA Orru - Chemistry–A European Journal, 2019 - Wiley Online Library
Monoterpenoid indole alkaloids are the major class of tryptamine‐derived alkaloids found in
nature. Together with their structural complexity, this has attracted great interest from …

2‐and 3‐Vinylindoles as 4π Components in Cycloaddition Reactions

E Rossi, G Abbiati, V Pirovano - European Journal of Organic …, 2017 - Wiley Online Library
The review summarizes the most recent achievements in the chemistry of 2‐vinylindoles and
3‐vinylindoles. In particular, we focus on the behavior of these compounds as dienes in …

Catalytic asymmetric Nazarov cyclization of heteroaryl vinyl ketones through a crystallographically defined chiral dinuclear nickel complex

T Takeda, S Harada, A Nishida - Organic letters, 2015 - ACS Publications
A Ni (NTf2) 2 and tetradentate bisimino-bisquinoline ligand complex catalyzed the
enantioselective Nazarov cyclization of heteroaryl vinyl ketones. An X-ray-quality crystal was …

Chiral holmium complex-catalyzed synthesis of hydrocarbazole from siloxyvinylindole and its application to the enantioselective total synthesis of (−)-Minovincine

T Morikawa, S Harada, A Nishida - The Journal of Organic …, 2015 - ACS Publications
The catalytic and enantioselective total synthesis of (−)-minovincine has been
accomplished. The key highly substituted hydrocarbazole derivative was obtained by an …

Synthesizing Chiral Hydrocarbazoles with a Tetrasubstituted Carbon Using Holmium-Catalyzed Enantioselective [4+ 2] Cycloaddition: Mechanistic Insights from …

S Harada, S Sekino, M Inaba, A Okita… - The Journal of …, 2024 - ACS Publications
This study analyzes the feasibility of utilizing the catalytic and enantioselective [4+ 2]
cycloaddition of sterically demanding heterocycle-incorporated siloxydienes to yield …

Catalytic and Enantioselective Diels‐Alder Reaction of Siloxydienes

S Harada, A Nishida - Asian Journal of Organic Chemistry, 2019 - Wiley Online Library
Diels‐Alder reaction is one of the most well‐known named reactions in organic chemistry. It
involves a diene substrate and a dienophile substrate. Among dienes, siloxydiene is a …

Highly enantioselective construction of carbazole derivatives via [4+ 2] cycloaddition of silyloxyvinylindoles and β, γ-unsaturated α-ketoesters

X Zhao, H Mei, Q Xiong, K Fu, L Lin, X Liu… - Chemical …, 2016 - pubs.rsc.org
A highly efficient catalytic asymmetric [4+ 2] cycloaddition of silyloxyvinylindoles with β, γ-
unsaturated α-ketoesters has been accomplished by an available chiral N, N …

[HTML][HTML] Total synthesis of carbazomycins A and B

S Wu, S Harada, T Morikawa… - Chemical and …, 2018 - jstage.jst.go.jp
Total syntheses of carbazomycins A and B were demonstrated using a ytterbium-catalyzed
Diels–Alder reaction with (silyloxyvinyl) indole as a diene. The densely substituted benzene …

Optically Active Helical Lanthanide Complexes: Storable Chiral Lewis Acidic Catalysts for Enantioselective Diels–Alder Reaction of Siloxydienes

S Harada, S Nakashima, S Sekino… - Chemistry–An Asian …, 2020 - Wiley Online Library
Lanthanide triflates and a series of hexadentate chiral ligand complexes were synthesized.
X‐ray‐quality crystals were obtained from mixtures of the lanthanide complexes, which were …

Employing α‐diazocarbonyl compound chemistry in the assembly of medicinally important aryl (alkyl) thiolactam scaffold

D Barkhatova, D Zhukovsky, D Dar'in… - European Journal of …, 2019 - Wiley Online Library
RH2 (OAc) 4‐catalyzed coupling of α‐diazo‐γ‐butyrolactams with a wide range of aliphatic
and aromatic thiols leads to α‐aryl (alkyl) thiolactams in generally good yields. The …