Novel radical chain reactions based on O-alkyl tin dithiocarbonates
作者:Jean Boivin、Jose Camara、Samir Z. Zard
DOI:10.1021/ja00046a045
日期:1992.9
US7625891B2
申请人:——
公开号:US7625891B2
公开(公告)日:2009-12-01
Heterocylic antiviral compounds
申请人:Rotstein David Mark
公开号:US20080249087A1
公开(公告)日:2008-10-09
This invention relates to piperidine derivatives of formula I wherein R
1
, R
2
, R
3
and R
4
are as defined herein useful in the treatment of a variety of disorders, including those in which the modulation of CCR5 receptors is implicated. Disorders that may be treated or prevented by the present derivatives include HIV and genetically related retroviral infections (and the resulting acquired immune deficiency syndrome, AIDS), rheumatoid arthritis, solid organ transplant reject (graft vs. host disease), asthma and COPD.
New methods for reductive free-radical cyclizations of α-bromoacetals to 2-alkoxytetrahydrofurans with activated chromium(II)-acetate
作者:Claus Hackmann、Hans J. Schäfer
DOI:10.1016/s0040-4020(01)81285-0
日期:1993.5
free-radical cyclization of α-bromoacetals 4 to 2-alkoxytetrahydrofurans 5 in 54–93% yield induced by activated chromium(II)-acetate. Four new methods have been developed in order to activate the transition metal. Two of them require only catalytic amounts of chromium(II)-acetate, because it can be regenerated in situ chemically or electrochemically. The diastereoselectivity of the cyclization depends on