Zobrazeno 1 - 10 of 18 pro vyhledávání: '"Daniel J. Poon"'
1
Scalable Synthesis of β-Amino Esters via Reformatsky Reaction with N-tert-Butanesulfinyl Imines
Autor: Daniel J. Poon, Doughan Brandon M, Brinner Kristin
Publikováno v: Synlett. 2009:991-993
The Reformatsky reagents derived from ethyl bromoacetate and tert-butyl bromoacetate add cleanly, in high yield, and with good diastereoselectivity to N-tert-butanesulfinyl aldimines and ketimines. Importantly, this reaction scales well (>50 mmol), a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c1c5a2b7495079eb680cde9d35ae728
https://doi.org/10.1055/s-0028-1087964
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2
Catalytic Asymmetric Synthesis of Quaternary Carbon Centers. Exploratory Investigations of Intramolecular Heck Reactions of (E)-α,β-Unsaturated 2-Haloanilides and Analogues To Form Enantioenriched Spirocyclic Products
Autor: Daniel J. Poon, Benoit Bachand, Atsuyuki Ashimori, Larry E. Overman
Publikováno v: Journal of the American Chemical Society. 120:6477-6487
The effect of chiral diphosphine structure, method of catalyst generation, reaction solvent, and HI scavenger on the formation of enantioenriched 3,3-disubstituted 2-oxindole 5 from asymmetric Heck cyclization of 4 was studied (eq 1). Depending upon
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bb66ddafc338b5f6dc82e57bf0f5374e
https://doi.org/10.1021/ja980786p
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3
Catalytic Asymmetric Synthesis of Quaternary Carbon Centers. Exploratory Studies of Intramolecular Heck Reactions of (Z)-α,β-Unsaturated Anilides and Mechanistic Investigations of Asymmetric Heck Reactions Proceeding via Neutral Intermediates
Autor: and Larry E. Overman, Benoit Bachand, c Michael A. Calter, Atsuyuki Ashimori, Daniel J. Poon d, Steven P. Govek
Publikováno v: Journal of the American Chemical Society. 120:6488-6499
Intramolecular Heck reactions of seven (Z)-α,β-unsaturated 2-iodoanilides catalyzed by Pd−BINAP were surveyed using two reaction conditions: (1) silver-promoted cyclizations in the presence of 2 equiv of Ag3PO4 and (2) base-promoted cyclizations
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4ef36331d310cd08496ff86512d78307
https://doi.org/10.1021/ja980787h
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5
ChemInform Abstract: Catalytic Asymmetric Synthesis of Either Enantiomer of Physostigmine. Formation of Quaternary Carbon Centers with High Enantioselection by Intramolecular Heck Reactions of (Z)-2-Butenanilides
Autor: Takaharu Matsuura, Daniel J. Poon, Atsuyuki Ashimori, Larry E. Overman
Publikováno v: ChemInform. 25
A practical method for preparing either enantiomer of physostigmine and congeners is reported. The Z stereochemistry of the butenanilide cyclization substrate is required to obtain high enantioselection (95% ee) in the key asymmetric Heck insertion
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::60a9370e8919b525a84fb4352fd153d4
https://doi.org/10.1002/chin.199416046
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8
ChemInform Abstract: Catalytic Asymmetric Synthesis of Quaternary Carbon Centers. Exploratory Investigations of Intramolecular Heck Reactions of (E)-α,β-Unsaturated 2-Haloanilides and Analogues to Form Enantioenriched Spirocyclic Products
Autor: Benoit Bachand, Larry E. Overman, Daniel J. Poon, Atsuyuki Ashimori
Publikováno v: ChemInform. 29
The effect of chiral diphosphine structure, method of catalyst generation, reaction solvent, and HI scavenger on the formation of enantioenriched 3,3-disubstituted 2-oxindole 5 from asymmetric Heck cyclization of 4 was studied (eq 1). Depending upon
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74565d460b2fb729da5e529814dee190
https://doi.org/10.1002/chin.199846130
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