Reductive Alkylation of Tertiary Lactams via Addition of Organocopper (RCu) Reagents to Thioiminium Ions
作者:Pierre Mateo、Joséphine E. Cinqualbre、Melinda Meyer Mojzes、Kurt Schenk、Philippe Renaud
DOI:10.1021/acs.joc.7b02150
日期:2017.12.1
A simple procedure for the conversion of tertiary lactams to 2-monoalkylated cyclic amines is described. The reaction sequence involves conversion of a lactam to a thioiminium ion followed by reaction with an organocopper (RCu) reagent and final reduction with triacetoxyborohydride. The reaction is high yielding and shows an excellent functional group tolerance. Its utility is demonstrated by a rapid
Sequential addition reaction of lithium acetylides and Grignard reagents to thioiminium salts from thiolactams leading to 2,2-disubstituted cyclic amines
作者:Toshiaki Murai、Rie Toshio、Yuichiro Mutoh
DOI:10.1016/j.tet.2006.04.065
日期:2006.6
The reaction of thioiminium salts derived from γ- and δ-thiolactams with lithium acetylides and Grignard reagents proceeded sequentially to give 2,2-disubstituted pyrrolidines and piperidines in moderate to high yields. In the initial step of the reaction, 2-(methylthio)pyrrolidines and -piperidines may be formed. The use of lithium (trimethylsilyl)acetylide gave the products most effectively. Aryl-
An anti-selective direct catalytic asymmetric aldol reaction of thiolactam is described. A soft Lewis acid/hard Brønsted base cooperative catalyst comprised of mesitylcopper/(R,R)-Ph-BPE exhibited high catalytic performance to produce an anti-aldol product with high stereoselectivity. The highly chemoselective nature of the present catalysis allows for the use of enolizable aldehydes as aldol acceptors
organomagnesium reagents to ketones, the thioiminium salts, easily prepared from lactams and amides are converted into 2,2-disubstituted and 2-monosubstituted amines by reaction with simple nucleophiles such as organocerium and organocopper reagents. The reaction of thioiminium iodides with organoceriumreagents derived by transmetalation of corresponding lithium reagents with anhydrous cerium(III) chloride
为了避免在向酮中添加有机锂和有机镁试剂过程中发生不希望的去质子,通过与简单的亲核试剂(如有机铈和有机铜试剂)反应,将容易由内酰胺和酰胺制备的硫亚胺盐转化为2,2-二取代和2-单取代胺。研究了碘化亚硫碘鎓与有机铈试剂的反应,该有机铈试剂是通过将相应的锂试剂与无水氯化铈(III)进行金属转移而得到的。这些碘化亚硫碘鎓可作为良好的亲电子试剂,并接受烷基铈的双加成反应。新合成的胺的特征是1 H和1313 C NMR,IR和质谱。胺已转化为其盐酸盐,并通过COSY进行表征。这些盐酸盐已用临床分离的微生物,金黄色葡萄球菌,肺炎克雷伯菌,铜绿假单胞菌,鼠伤寒沙门氏菌和白色念珠菌进行了抗菌筛选。盐酸盐对这些细菌和真菌显示出相当好的活性。
An Efficient Method To Convert Lactams and Amides into 2,2-Dialkylated Amines
A practical method for the synthesis of gem-2,2-disubstituted tertiary amines from the corresponding lactams (or amides) is reported. It is based on the reaction of thioiminium ions, easily prepared from lactams and amides with organometallic reagents such allylmagnesium, benzylmagnesium, and primary alkylcerium reagents.