Total Synthesis of Hybocarpone and Analogues Thereof. A Facile Dimerization of Naphthazarins to Pentacyclic Systems
作者:K. C. Nicolaou、David L. F. Gray
DOI:10.1021/ja030497n
日期:2004.1.1
The total synthesis of the lichen-derived antitumor agent hybocarpone (1) and related compounds is described. The successful route to hybocarpone features a novel radical-based dimerization/hydration cascade which generates the bridging hindered carbon-carbon bond of the molecule in a stereocontrolled manner, setting the relative configurations of the four contiguous stereocenters in a single step
作者:Alistair J. M. Farley、Christopher Sandford、Darren J. Dixon
DOI:10.1021/jacs.5b10226
日期:2015.12.30
The highly enantioselective sulfa-Michael addition of alkyl thiols to unactivated α-substituted acrylate esters catalyzed by a bifunctional iminophosphorane organocatalyst under mild conditions is described. The strong Brønsted basicity of the iminophosphorane moiety of the catalyst provides the necessary activation of the alkyl thiol pro-nucleophile, while the two tert-leucine residues flanking a
Chiral Calcium Complexes as Brønsted Base Catalysts for Asymmetric Addition of α-Amino Acid Derivatives to α,β-Unsaturated Carbonyl Compounds
作者:Susumu Saito、Tetsu Tsubogo、Shū Kobayashi
DOI:10.1021/ja0709730
日期:2007.5.1
promote the catalyticasymmetric 1,4-addition reactions and [3+2] cycloaddition reactions of α-amino acidderivatives with α,β-unsaturated carbonyl compounds have been developed. The reactions proceeded smoothly in the presence of 5−10 mol % of the chiral calcium catalyst to afford the desired adducts in high yields with high diastereo- and enantioselectivities. A wide range of α,β-unsaturated esters and
CONSTRAINED COMPOUNDS AS CGRP-RECEPTOR ANTAGONISTS
申请人:Chaturvedula Prasad V.
公开号:US20070259851A1
公开(公告)日:2007-11-08
The invention encompasses constrained bicyclic and tricyclic CGRP-receptor antagonists, methods for identifying them, pharmaceutical compositions comprising them, and methods for their use in therapy for treatment of migraine and other headaches, neurogenic vasodilation, neurogenic inflammation, thermal injury, circulatory shock, flushing associated with menopause, airway inflammatory diseases, such as asthma and chronic obstructive pulmonary disease (COPD), and other conditions the treatment of which can be effected by the antagonism of CGRP-receptors.
Development and Scope of the Arene-Fused Domino Michael/Mannich Reaction: Application to the Total Syntheses of <i>Aspidosperma</i> Alkaloids (−)-Aspidospermidine, (−)-Tabersonine, and (−)-Vincadifformine
作者:Senzhi Zhao、Rodrigo B. Andrade
DOI:10.1021/acs.joc.6b02551
日期:2017.1.6
Michael/Mannich route to the tetrahydrocarbazole (ABE) core of Aspidosperma alkaloids is described. The scope of this novel transformation was studied in terms of the nucleophilic component (i.e., N-sulfinyl metallodienamine) and the electrophilic component (i.e., Michael acceptor). The successful application of this methodology toward the concise total syntheses of classical indole alkaloids (−)-aspidospermidine