Synthesis of (±)-coerulescine and a formal synthesis of (±)-horsfiline
摘要:
A straightforward synthesis of (+/-)-coerulescine and (+/-)-horsfiline has been established from 3-formyl-3-phenylpyrridine employing 4-hydroxypiperidine as the starting material. There are two remarkable steps for the synthesis of (+/-)-coerulescine and ()-horsfiline. One is the rapid access to produce 3-formyl-3-phenylpyrrolidine by Lewis acid-catalyzed rearrangement of 3,4-dihydroxy-4-phenylpiperidine. The other key step is an intramolecular electrophilic cyclization from 3-benzylcarbamoyl-3-plienylpyrrolidine to the 3,3-spirocyclic 2-oxindole ring skeleton. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of (±)-coerulescine and a formal synthesis of (±)-horsfiline
摘要:
A straightforward synthesis of (+/-)-coerulescine and (+/-)-horsfiline has been established from 3-formyl-3-phenylpyrridine employing 4-hydroxypiperidine as the starting material. There are two remarkable steps for the synthesis of (+/-)-coerulescine and ()-horsfiline. One is the rapid access to produce 3-formyl-3-phenylpyrrolidine by Lewis acid-catalyzed rearrangement of 3,4-dihydroxy-4-phenylpiperidine. The other key step is an intramolecular electrophilic cyclization from 3-benzylcarbamoyl-3-plienylpyrrolidine to the 3,3-spirocyclic 2-oxindole ring skeleton. (c) 2005 Elsevier Ltd. All rights reserved.
Highly Enantioselective Organocatalytic Oxidative Kinetic Resolution of Secondary Alcohols Using Chiral Alkoxyamines as Precatalysts: Catalyst Structure, Active Species, and Substrate Scope
The development and characterization of enantioselective organocatalyticoxidative kinetic resolution (OKR) of racemic secondaryalcoholsusing chiral alkoxyamines as precatalysts are described. A number of chiral alkoxyamines have been synthesized, and their structure-enantioselectivity correlation study in OKR has led us to identify a promising precatalyst, namely, 7-benzyl-3-n-butyl-4-oxa-5-azahomoadamantane
Catalytic Friedel‐Crafts Reactions on Saturated Heterocycles and Small Rings for sp
<sup>3</sup>
‐sp
<sup>2</sup>
Coupling of Medicinally Relevant Fragments
作者:Rosemary A. Croft、Maryne A. J. Dubois、Alexander J. Boddy、Camille Denis、Anna Lazaridou、Anne Sophie Voisin‐Chiret、Ronan Bureau、Chulho Choi、James J. Mousseau、James A. Bull
DOI:10.1002/ejoc.201900498
日期:2019.9
A systematic comparison of Lewis acid catalysts [Ca(II), Li(I) and Fe(III)] is presented for catalytic Friedel–Crafts reactions using alcohols on 4‐, 5‐, and 6‐membered oxygen and nitrogen heterocycles and cyclobutanes, forming gem‐diaryl quaternary centers.