Homologation of Isocyanates with Lithium Carbenoids: A Straightforward Access to α-Halomethyl- and α,α-Dihalomethylamides
摘要:
Treatment of widely available isocyanates with monohalolithium and dihalolithium carbenoids provides a valuable protocol for the one-pot preparation of -halo- and ,-dihaloacetamide derivatives. While monohalolithium carbenoids can be prepared by a smooth lithium-halogen exchange, the preparation of the corresponding dihalo compounds proved to be highly dependent on the base used to realize the deprotonation, with lithium 2,2,6,6-tetramethylpiperidine emerging as optimal. The clear advantages of the procedure are: (a) broad scope of isocyanates that can be employed; (b) preservation of the optical purity when chiral materials are used; (c) divergent access to different haloamides by simply selecting the homologating agents. We also report an application of Charette's imidoyl triflate activation of a secondary amide to the synthesis of an -chloro ketone and N-15 NMR data for selected compounds.
The present invention relates to compounds of formula I:
wherein R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are as defined in the specification and claims, which compounds are active on the GABA
B
receptor and are useful in the control or prevention of CNS illnesses, especially of illnesses and disorders comprising anxiety, depression, epilepsy, schizophrenia, and cognitive disorders.
本发明涉及以下式I的化合物:
其中R1、R2、R3、R4、R5和R6如规范和声明中定义的那样,这些化合物对GABA
B
受体具有活性,并且在控制或预防中枢神经系统疾病,特别是包括焦虑、抑郁症、癫痫、精神分裂症和认知障碍的疾病和疾病中是有用的。
[EN] HIV INTEGRASE INHIBITORS<br/>[FR] INHIBITEURS DE L'INTEGRASE DU VIH
申请人:MERCK & CO INC
公开号:WO2005092099A1
公开(公告)日:2005-10-06
Bicyclic uracils and related compounds are inhibitors of HIV integrase and inhibitors of HIV replication. In one embodiment, the compounds are of Formula (I) wherein a, b, Y, R1, R2, R3 and R4 are defined herein. The compounds are useful in the prevention and treatment of infection by HIV and in the prevention, delay in the onset, and treatment of AIDS. The compounds are employed against HIV infection and AIDS as compounds per se or in the form of pharmaceutically acceptable salts. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines.
The invention concerns the use of a quinazoline derivative of Formula (I) wherein Q
1
includes a quinazoline ring optionally substituted with a group such as halogeno, trifluoromethyl and cyano, or a group of the formula: Q
3
—X
1
— wherein X
1
includes a direct bond and O and Q
3
includes aryl, aryl-(1-6C)alkyl, heterocyclyl and heterocyclyl-(1-6C)alkyl; each of R
2
and R
3
is hydrogen or (1-6C)alkyl; Z includes O, S and NH; and Q
2
includes aryl and aryl-(1-3C)alkyl or a pharmaceutically-acceptable salt thereof, in the manufacture of a medicament for use in the production of an antiangiogenic and/or vascular permeability reducing effect in a warm-blooded animal such as a human.
1
The invention concerns quinazoline derivatives of Formula (I) wherein Q1 includes a quinazoline ring optionally substituted with a group such as halogeno, trifluoromethyl and cyano, or a group of the formula: Q3—X1— wherein X1 includes a direct bond and O and Q3 includes aryl, aryl-(1-6C)alkyl, heterocyclyl and heterocyclyl-(1-6C)alkyl; each of R2 and R3 is hydrogen or (1-6C)alkyl; Z includes O, S and NH; and Q2 includes aryl and aryl-(1-3C)alkyl or a pharmaceutically-acceptable salt thereof; processes for their preparation, pharmaceutical compositions containing them and their use in the manufacture of a medicament for use in the prevention or treatment of T cell mediated diseases or medical conditions in a warm-blooded animal.
Alkyl Isocyanates via Manganese-Catalyzed C–H Activation for the Preparation of Substituted Ureas
作者:Xiongyi Huang、Thompson Zhuang、Patrick A. Kates、Hongxin Gao、Xinyi Chen、John T. Groves
DOI:10.1021/jacs.7b07658
日期:2017.11.1
range of functionalities. In this work, we have developed the first synthetic method for preparing aliphatic isocyanates via direct C-Hactivation. This method proceeds efficiently at room temperature and can be applied to functionalize secondary, tertiary, and benzylic C-H bonds with good yields and functional group compatibility. Moreover, the isocyanate products can be readily converted to substituted