Palladium-Promoted Neutral 1,4-Brook Rearrangement/Intramolecular Allylic Cyclization Cascade Reaction: A Strategy for the Construction of Vinyl Cyclobutanols
作者:Hao Zhang、Shiqiang Ma、Ziyun Yuan、Peng Chen、Xingang Xie、Xiaolei Wang、Xuegong She
DOI:10.1021/acs.orglett.7b01381
日期:2017.7.7
cascade reaction to build vinyl cyclobutanol rings through activation of vinyl epoxides by palladium, followed by 1,4-Brook rearrangement and intramolecular cyclization with a palladium complex of the resulting carbon anion, is described. Through this cascade reaction, several highly substituted cyclobutanol substrates were achieved in good yields with high stereoselectivities.
Regio- and Stereochemical Studies on the Nitroso-Diels-Alder Reaction with 1,2-Disubstituted Dienes
作者:Gilles Galvani、Robert Lett、Cyrille Kouklovsky
DOI:10.1002/chem.201302905
日期:2013.11.11
regioselectivity of the nitroso‐Diels–Alder reaction between unsymmetrical acyclic dienes and Boc‐nitroso (Boc=tert‐butoxycarbonyl) reagent or the Wightman chiral chloronitroso reagents has been studied. With the Boc‐nitroso reagent, the selectivity is a consequence of steric effects at the C1‐position in the diene and electronic effects at the C2‐position in the diene. The combination of an unprotected hydroxyethyl
Substituted fused bicyclic amines as modulators of chemokine receptor activity
申请人:Batt G. Douglas
公开号:US20050197373A1
公开(公告)日:2005-09-08
The present application describes modulators of CCR3 of formula (Ia) and (Ib):
or pharmaceutically acceptable salt forms thereof, wherein Z, R
1
, R
2
, R
3
, R
4
, R
5
, R
5
′, R
6
, a, b, c, d, and u are as defined herein. In addition, methods of treating and preventing inflammatory diseases such as asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis using said modulators are disclosed.
Total Synthesis of (±)-Nardoaristolone B and Its Analogues
作者:Kishor L. Handore、D. Srinivasa Reddy
DOI:10.1021/ol501949r
日期:2014.8.15
The first totalsynthesis of nardoaristolone B, a nor-sesquiterpenoid with an unusual fused ring system and having protective effects on the injury of neonatal rat cardiomyocytes, has been accomplished. Stereoselective synthesis of its novel analogues inlcuding exo-cyclopropyl ring fusion is also part of this disclosure. In addition, an alternate and more efficient one-step method to make a 3/5/6 tricyclic
Intramolecular [1 + 4 + 1] Cycloaddition: Establishment of the Method
作者:Douglass F. Taber、Pengfei Guo、Na Guo
DOI:10.1021/ja103551x
日期:2010.8.18
bicyclic and polycyclic ring systems having defined relative and absolute configuration. Approaches that allow the construction of more than one carbocyclic ring at a time have proven valuable, in particular those that allow at the same time the control of an array of new stereogenic centers. One of the most general and most widely used protocols has been the intramolecularDiels-Alder [4 + 2] cycloaddition