Unusual and Unexpected Reactivity of <i>t-</i>Butyl Dicarbonate (Boc<sub>2</sub>O) with Alcohols in the Presence of Magnesium Perchlorate. A New and General Route to <i>t-</i>Butyl Ethers
[reaction: see text] A new mild method for protecting alcohols as t-butylethers is reported. The reaction proceeds with Mg(ClO4)2 and Boc2O and shows general applicability. The deprotection of t-butylethers has also been revisited. Preliminary results indicate the CeCl3 x 7H2O/NaI system is a very suitable catalyst for their removal.
[反应:见正文]据报道,一种新的温和的保护叔丁醚醇的方法。反应与Mg(ClO4)2和Boc2O进行,显示出一般的适用性。也已经重新考虑了叔丁基醚的脱保护。初步结果表明,CeCl3 x 7H2O / NaI体系是非常适合去除它们的催化剂。
Alcohols and Di-<i>tert</i>-butyl Dicarbonate: How the Nature of the Lewis Acid Catalyst May Address the Reaction to the Synthesis of <i>tert</i>-Butyl Ethers
exclusive products with un-delocalized isopropoxide or low-delocalized acetate ions. The metal ion influences only the reaction rate, roughly following standard parameters for calculating Lewis acidity. A reaction mechanism is supposed, and a series of experimental evidences is reported to support it. These studies allowed us to conclude that, to synthesize tert-butyl ethers, in reactions involving aliphatic
In one aspect, the invention relates to compounds of formula I:
where a and R
1-6
are as defined in the specification, or a pharmaceutically acceptable salt thereof. The compounds of formula I are serotonin and norepinephrine reuptake inhibitors. In another aspect, the invention relates to pharmaceutical compositions comprising such compounds; methods of using such compounds; and process and intermediates for preparing such compounds.
Disclosed herein are compounds useful for modulating the mu-opioid receptor (“MOR”) and/or delta-opioid receptor (“DOR”), and methods of using these compounds to treat diseases and conditions, such as pain. In particular, disclosed herein are compounds of Formula (I) and pharmaceutically acceptable salt thereof:
wherein the substituents are as described.
SUBSTITUTED N-(4-CYANO-1H-PYRAZOL-3-YL)METHYLAMINE DERIVATIVES, PREPARATION THEREOF AND THERAPEUTIC USE THEREOF
申请人:BARTH Francis
公开号:US20100041709A1
公开(公告)日:2010-02-18
The present invention relates to compounds corresponding to formula (I):
Wherein X, R
1
, R
2
, R
3
and R
4
are as defined herein. The invention further relates to preparation and therapeutic use of these compounds.