Primary thioamides have been utilised directly in water, without any derivatisation, to selectively thioacylate primary amines. By employing 2-hydroxyethylamines, the reaction can be extended to the preparation of 2-thiazolines via formation of β-hydroxythioamides.
Facile Syntheses of Oxazolines and Thiazolines with <i>N</i>-Acylbenzotriazoles under Microwave Irradiation
作者:Alan R. Katritzky、Chunming Cai、Kazuyuki Suzuki、Sandeep K. Singh
DOI:10.1021/jo0355092
日期:2004.2.1
Microwave reactions of 2-amino-2-methyl-1-propanol (2) or 2-aminoethanethiol hydrochloride (4) with readily available N-acylbenzotriazoles 1a−j in the presence of SOCl2 produced 2-substituted 2-oxazolines 3a−j in 84−98% yields and 2-substituted thiazolines 5a−i in 85−97% yields, respectively. With use of this method chiral oxazoline 6, bisoxazoline 7, bisthiazoline 8, and 5,6-dihydro-4H-1,3-oxazines
在SOCl 2的存在下,2-氨基-2-甲基-1-丙醇(2)或2-氨基乙硫醇盐酸盐(4)与易于获得的N-酰基苯并三唑1a - j的微波反应产生了2-取代的2-恶唑啉3a - j分别以84-98%的产率和2-取代的噻唑啉5a - i的产率为85-97%。使用该方法时,手性恶唑啉6,双恶唑啉7,双噻唑啉8和5,6-二氢-4 H -1,3-恶嗪9或10还制备了82-96%的产率。这些结果证明了N-酰基苯并三唑在温和条件下和微波辐射下反应时间短的情况下在恶唑啉和噻唑啉制备中的新应用。
Thionation ofN-(?-Halogenoalkyl)-Substituted Amides withLawesson's Reagent: Facile Synthesis of 4,5-Dihydro-1,3-thiazoles and 5,6-Dihydro-4H-1,3-thiazines
作者:Yasuhiro Kodama、Mayuko Ori、Takehiko Nishio
DOI:10.1002/hlca.200590000
日期:2005.2
The thionation and cyclization of N-(ω-halogenoalkyl)-substitutedamides (and related compounds) with Lawesson's reagent (LR=2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide) has been investigated. Treatment of the amides 1 with LR gave the corresponding thioamides 2 in moderate to good yields (Table). The latter, upon treatment with base, afforded, either in a separate step or in
[EN] NOVEL E,E-DIENE COMPOUNDS AND THEIR USE AS MEDICAMENTS AND COSMETICS<br/>[FR] NOUVEAUX COMPOSÉS E,E-DIÉNIQUES ET LEUR UTILISATION COMME MÉDICAMENTS ET PRODUITS COSMÉTIQUES
申请人:WOLFF AUGUST GMBH & CO KG ARZNEIMITTEL DR
公开号:WO2012069605A1
公开(公告)日:2012-05-31
The present invention relates to a novel class of E,E-diene compounds and their use as a medicament, preferably as a dermatologic agent, and as a cosmetic. These novel compounds are particularly useful in treating and/or preventing inflammation, irritation, itching, pruritus, pain, oedema and/or pro-allergic or allergic conditions in a patient. Usually they are topically applied to the skin or mucosa in the form of a pharmaceutical or cosmetic composition comprising the compound and a pharmaceutically and/or cosmetically acceptable carrier.
Easy access to thiazolines and thiazines via tandem S-alkylation-cyclodeamination of thioamides/haloamines
作者:Uma Pathak、Shubhankar Bhattacharyya、Vishwanath Dhruwansh、Lokesh Kumar Pandey、Rekha Tank、Malladi V. S. Suryanarayana
DOI:10.1039/c1gc15285h
日期:——
This is the first report of a facile synthesis of thiazolines and thiazines from a self-catalyzed, water assisted tandem S-alkylation-cyclodeamination reaction of thioamides/haloamines. The reaction is clean and efficient with simple product work-up, and is applicable to a variety of substrates.