Reductive deprotection of allyl, benzyl and sulfonyl substituted alcohols, amines and amides using a naphthalene-catalysed lithiation
摘要:
The reaction of different protected alcohols, amines and amides with lithium and a catalytic amount of naphthalene (4 mol %) in THF at low temperature leads to their deprotection under very mild reaction conditions, the process being in many cases chemoselective. (C) 1997 Elsevier Science Ltd.
The invention relates to sulphonamide derivatives of formula (I),
where
R
C
is optionally substituted 4-6-membered heterocyclic ring containing one or more N atoms, or
R
C
forms together with the phenyl ring to which it is attached a benzodioxolyl group, or
R
C
is —NR
1
R
2
,
R
A
is a group having the formula
R
B
is hydrogen or alkyl.
The invention also relates to the use of derivatives of formula (I) as inhibitors for collagen receptor integrins and a process for preparing sulphonamides of formula (I).
该发明涉及式(I)的磺胺基衍生物,
其中
R
C
是可选取代的含有一个或多个N原子的4-6元杂环环,或
R
C
与其连接的苯环一起形成苯二氧杂基团,或
R
C
是-NR
1
R
2
,
R
A
是具有式的基团
R
B
是氢或烷基。
该发明还涉及将式(I)的衍生物用作胶原受体整合素的抑制剂以及制备式(I)的磺胺基的方法。
Gold-catalyzed substitution reaction with ortho-alkynylbenzoic acid alkyl ester as an efficient alkylating agent
ortho-Alkynylbenzoic acid alkyl esters behave as alkylating agents in combination with gold catalysts. The reaction with alcohols occurs smoothly in the presence of catalytic amounts of Ph3PAuCl and AgOTf under mild conditions to produce the corresponding ether products in high yields. The protocol is also useful for Friedel–Crafts alkylation and N-alkylation of sulfonamides. The reaction likely proceeds
Palladium-Catalyzed α-Arylation of Methyl Sulfonamides with Aryl Chlorides
作者:Bing Zheng、Minyan Li、Gui Gao、Yuying He、Patrick J. Walsh
DOI:10.1002/adsc.201600090
日期:2016.6.30
A palladium‐catalyzedα‐arylation of sulfonamides with aryl chlorides is presented. A Buchwald‐type pre‐catalyst formed with Kwong’s indole‐based ligand enabled this transformation to be compatible with a large variety of methyl sulfonamides and aryl chlorides in good to excellent yields. Importantly, under the optimized reaction conditions, only mono‐arylated products were observed. This method has
Electrochemical Oxidative Amination of Sodium Sulfinates: Synthesis of Sulfonamides Mediated by NH<sub>4</sub>I as a Redox Catalyst
作者:Yang-ye Jiang、Qing-Qing Wang、Sen Liang、Li-Ming Hu、R. Daniel Little、Cheng-Chu Zeng
DOI:10.1021/acs.joc.6b00615
日期:2016.6.3
An efficient protocol for the synthesis of sulfonamides via the electrochemical oxidativeamination of sodiumsulfinates has been developed. The chemistry proceeds in a simple undivided cell employing a substoichiometric amount of NH4I that serves both as a redox catalyst and a supporting electrolyte; in this manner additional conducting salt is not required. A wide range of substrates, including aliphatic