An Expedient Route to the Tetrazole Analogues of α-Amino Acids
摘要:
[GRAPHIC]Convenient conditions are described for the transformation of alpha-aminonitriles to the tetrazole analogues of alpha-amino acids. Refluxing the starting material in water/2-propanol at 80 degreesC with sodium azide and catalytic zinc bromide affords the tetrazole product in yields generally exceeding 90%.
Efficient Conversion of Nitriles to Amides with Basic Hydrogen Peroxide in Dimethyl Sulfoxide
作者:Alan R. Katritzky、Boguslaw Pilarski、Laszlo Urogdi
DOI:10.1055/s-1989-27441
日期:——
Nitriles 1 are efficiently transformed into N-unsubstituted amides 2 at 20°C in 5-30 mins in good yield and with high selectivity, using basic 30% hydrogen peroxide in dimethyl sulfoxide.
Synthetic application of in situ generation of N-acyliminium ions from α-amido p-tolylsulfones for the synthesis of α-amino nitriles
作者:Santosh T. Kadam、Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1016/j.tet.2010.01.010
日期:2010.2
N-acyliminium ions, which undergo the nucleophilic addition of trimethylsilyl cyanide (TMSCN) to provide the N-protected α-aminonitriles in very good yield. A variety of α-amido p-tolylsulfones were prepared from aromatic as well as aliphatic aldehydes for the synthesis of α-aminonitriles.
A Mild and Efficient Catalytic
Strecker Reaction of <i>N</i>-Alkoxycarbonylamino Sulfones
with Trimethylsilyl Cyanide Using Indium(III) Chloride: A Facile Synthesis
of α-Aminonitriles
The Strecker reaction of N-alkoxycarbonylamino -sulfoneswith trimethylsilyl cyanide in the presence of catalytic amountof indium(III) chloride at room temperature produces the correspondingprotected α-aminonitriles in high yields.
Conversion of <i>N</i>-Benzyloxycarbonylamino- and <i>N</i>-Tosylamino-Benzyl Phenylsulfones by Green Strecker Reactions to α-Aminobenzyl Nitriles Using Potassium Hexacyanoferrate(II)
作者:Xiaochun Hu、Rongzhi Li、Zheng Li
DOI:10.3184/174751914x14030207593683
日期:2014.7
α-aminobenzyl nitriles has been achieved by eco-friendly Strecker reactions using potassium hexacyanoferrate(II) as a cyanide source, benzoyl chloride as a promoter, and potassium hydroxide as a base. The protocol has the advantages of using a nontoxic, nonvolatile and inexpensive cyanatingagent, employing a simple work-up procedure and producing high yields.
使用六氰基高铁酸钾 (II) 作为氰化物源,通过生态友好的 Strecker 反应实现了由 N-苄氧基羰基氨基和 N-甲苯磺基氨基-苄基苯砜原位生成的醛亚胺氰化为相应的 N-保护的 α-氨基苄基腈,苯甲酰氯作为促进剂,氢氧化钾作为碱。该协议的优点是使用无毒、非挥发性和廉价的氰化剂,采用简单的处理程序,产量高。
Anti-tumour compounds
申请人:ZENECA LIMITED
公开号:EP0459730A2
公开(公告)日:1991-12-04
The invention relates to quinazoline derivatives, or pharmaceutically-acceptable salts thereof, which possess anti-tumour activity; to processes for their manufacture; and to pharmaceutical compositions containing them.
The invention provides a quinazoline of the formula:-
wherein R¹ includes hydrogen, amino and alkyl or alkoxy each of up to 4 carbon atoms;
R² includes hydrogen, alkyl, hydroxyalkyl and halogenoalkyl each of up to 4 carbon atoms;
R³ is hydrogen or alkyl or up to 3 carbon atoms;
Ar is phenylene or heterocyclene;
L is a group of the formula -CO.NH-, -NH.CO-, -CO.NR⁴-, -NR⁴.CO-, -CH=CH- or -CO.O-, wherein R⁴ is alkyl of up to 4 carbon atoms; and
Y is a branched alkyl group bearing substituents Y² and Y³ the definition of each independently including hydroxy, cyano, aryl and heteroaryl, and the definition of Y³ also optionally including sulpho, N-phenylsulphonylcarbamoyl and 5-tetrazolyl;
or a pharmaceutically-acceptable salt thereof.