Spirocyclic Dihydropyridines by Electrophile-Induced Dearomatizing Cyclization of N-Alkenyl Pyridinecarboxamides
摘要:
On treatment with acylating or sulfonylating agents, N-alkenyl pyridine carboxamides (N-pyridinecarbonyl enamines) undergo a dearomatizing cyclization initiated by pyridine acylation and followed by intramolecular trapping of the resulting pyridinium cation. The products are spirocyclic dihydropyridines which may be further elaborated to spirocyclic heterocycles with drug-like features.
Spirocyclic Dihydropyridines by Electrophile-Induced Dearomatizing Cyclization of N-Alkenyl Pyridinecarboxamides
摘要:
On treatment with acylating or sulfonylating agents, N-alkenyl pyridine carboxamides (N-pyridinecarbonyl enamines) undergo a dearomatizing cyclization initiated by pyridine acylation and followed by intramolecular trapping of the resulting pyridinium cation. The products are spirocyclic dihydropyridines which may be further elaborated to spirocyclic heterocycles with drug-like features.
Unprecedented asymmetric induction from a chiral acetate enolate equivalent. The condensation of acetyl(triphenylphosphine)carbonyl-.eta.-cyclopentadienyliron [(.eta.-C5H5)Fe(CO)(PPh3)(Ac)] with imines
作者:Lanny S. Liebeskind、Mark E. Welker、Virgil Goedken
DOI:10.1021/ja00314a042
日期:1984.1
Diverses imines se condensent avec le diethyl-Al-enolate du racemique (η-C 5 H 5 )Fe(CO)(PPh 3 )COCH 3 en donnant des produits de condensation avec un bon rendement
Diverses 亚胺 se condensent avec le diethyl-Al-enolate du racemique (η-C 5 H 5 )Fe(CO)(PPh 3 )COCH 3 en donnant des produits de condensent avec un bon rendement
The threo-selective reaction of allenic organometallic compounds with imines
The reaction between the imines (2) and the allenicorganometalliccompounds (3) gives the threo adducts (4) with very high stereoselectivity, while the reaction with 9-but-2-enyl-9-borabicyclo[3.3.1]nonane gives the analogous erythro allylamines stereoselectively.
Synthesis of substituted pyrroles from an alkyne, an imine and carbon monoxide via an organotitanium intermediate
作者:Yuan Gao、Masaaki Shirai、Fumie Sato
DOI:10.1016/0040-4039(96)01778-9
日期:1996.10
Azatitanacyclopentene complexes 2 react with carbon monoxide under atmospheric pressure to afford pyrroles in good to excellent yields, thus providing a convenient and general method for synthesis of substitutedpyrroles from an alkyne, an imine and carbon monoxide.
<i>In Situ</i> Generation of Titanium-imine Complexes from Imines and Ti(O<i>i</i>Pr)<sub>4</sub>/2 <i>i</i>PrMgX, and Their Reactions with Alkynes, Nitriles and Imines
作者:Yuan Gao、Yukio Yoshida、Fumie Sato
DOI:10.1055/s-1997-1555
日期:——
Reaction of (η2-propene)Ti(OiPr)2 (1), readily generated in situ by the reaction of Ti(OiPr)4 with 2 equiv of iPrMgCl, with imines affords the titanium-imine complexes in moderate to excellent yields, which undergo coupling reactions with alkynes, nitriles and imines.
HETEROARYL ANTAGONISTS OF PROSTAGLANDIN D2 RECEPTORS
申请人:Hutchinson John Howard
公开号:US20110319445A1
公开(公告)日:2011-12-29
Described herein are heteroaryl compounds that are antagonists of PGD2 receptors. Also described are pharmaceutical compositions and medicaments that include the heteroaryl compounds described. Also described herein are methods of using such antagonists of PGD2 receptors, alone and in combination with other compounds, for treating respiratory, cardiovascular, and other PGD2-dependent or PGD2-mediated conditions or diseases.