Enediynes, enyne‐allenes, their reactions, and beyond

E Kraka, D Cremer - Wiley Interdisciplinary Reviews …, 2014 - Wiley Online Library
Enediynes undergo a Bergman cyclization reaction to form the labile 1, 4‐didehy‐
drobenzene (p‐benzyne) biradical. The energetics of this reaction and the related Schreiner …

Recent advances in Garratt-Braverman cyclization: Mechanistic and synthetic explorations

P Bhattacharya, M Singha, E Das, A Mandal, M Maji… - Tetrahedron …, 2018 - Elsevier
Garratt-Braverman cyclization has emerged as one of the simplest synthetic tool to construct
two consecutive Csingle bondC bonds leading to the formation of various important …

Double SO2 Insertion into 1,7-Diynes Leading to Functionalized Naphtho[1,2-c]thiophene 2,2-dioxides

AF Wang, WJ Hao, YL Zhu, G Li, P Zhou, SJ Tu… - ACS …, 2018 - ACS Publications
A novel metal-free double SO2 insertion/multicomponent bicyclization cascade of benzene-
linked 1, 7-diynes has been established by treatment with aryldiazonium tetrafluoroborates …

Mechanistic studies on garratt–braverman cyclization: the diradical–cycloaddition puzzle

J Das, SS Bag, A Basak - The Journal of Organic Chemistry, 2016 - ACS Publications
In this work, we present the results of extensive multiprong studies involving the fate of
deuterium-labeled substrates, EPR, trapping experiments, and LA-LDI mass spectrometry to …

Cascade Nucleophilic Attack/Addition Cyclization Reactions to Synthesize Oxazolidin-2-imines via (Z)-2-Bromo-3-phenylprop-2-en-1-ols/3-phenylprop-2-yn-1-ols …

Z Li, L Zhao, Y Zhang, H Yan, X Huang… - The Journal of Organic …, 2022 - ACS Publications
Two concise strategies to synthesize oxazolidin-2-imines by cascade nucleophilic
attack/addition cyclization reactions of (Z)-2-bromo-3-phenylprop-2-en-1-ols/3-phenylprop-2 …

Garratt–Braverman cyclization, a powerful tool for C–C bond formation

S Mondal, T Mitra, R Mukherjee, PS Addy, A Basak - Synlett, 2012 - thieme-connect.com
Development of new strategies for C–C bond formation remains in the forefront of organic
synthesis. The base-mediated rearrangement of bis-propargyl sulfones via bis-allenes …

Selectivity in Garratt–Braverman Cyclization of Aryl-/Heteroaryl-Substituted Unsymmetrical Bis-Propargyl Systems: Formal Synthesis of 7′-Desmethylkealiiquinone

J Das, R Mukherjee, A Basak - The Journal of Organic Chemistry, 2014 - ACS Publications
Unsymmetrical bis-propargyl ethers and sulfonamides containing various combinations of
aryl/heteroaryl substituents at the acetylene termini were synthesized, and their reactivity …

Exploring Diradical Chemistry: A Carbon‐Centered Radical May Act as either an Anion or Electrophile through an Orbital Isomer

TP Gonçalves, M Mohamed, RJ Whitby… - Angewandte Chemie …, 2015 - Wiley Online Library
Diradical intermediates, formed by thermolysis of alkynylcyclobutenones, can display
radical, anion, or electrophilic character because of the existence of an orbital isomer with …

Thermal cycloisomerization of putative allenylpyridines for the synthesis of isoquinoline derivatives

AE Morrison, JJ Hrudka, GB Dudley - Organic letters, 2016 - ACS Publications
A cascade (cyclo) isomerization/elimination process produces novel isoquinoline derivatives
of potential interest for pharmaceutical, biomedical, and energy-related research …

Synthesis of benzochromenes and dihydrophenanthridines with helical motifs using Garratt–Braverman and Buchwald–Hartwig reactions

P Bhattacharya, K Senapati, K Chattopadhyay… - RSC …, 2015 - pubs.rsc.org
A simple strategy for the synthesis of 6H-benzo [c] chromenes and 5, 6-
dihydrophenanthridines through a judicious use of Garratt–Braverman (GB) cyclization and …