cascade reaction of azides with isonitrile and amines is presented; it offers an alternative facile approach toward N-sulfonyl-, N-phosphoryl-, and N-acyl-functionalized guanidines in excellent yield. These series of substituted guanidines exhibit potential biological and pharmacological activities. In addition, the less reactive intermediate benzoyl carbodiimide could be isolated by silica gel column flash
Amidine is a notable nitrogen‐containing structural motif found in bioactive natural products and pharmaceuticals. Herein, a novel rhodium(I)‐catalyzed tandem reaction of readily accessible azides with isonitriles and boronic acids via a carbodiimideintermediate is achieved. This protocol offers an alternative approach toward N‐sulfonyl‐, N‐acyl‐, and N‐ phosphoryl‐functionalized, as well as general
Ruthenium(iv) porphyrin catalyzed phosphoramidation of aldehydes with phosphoryl azides as a nitrene source
作者:Wenbo Xiao、Cong-Ying Zhou、Chi-Ming Che
DOI:10.1039/c2cc31686b
日期:——
[RuIV(por)Cl2] (por = porphyrin dianion) can efficiently catalyze nitrene insertion into aldehyde C–H bonds with phosphoryl azides as a nitrene source to give N-acylphosphoramidates in good to high yields.
6-dideuteronoreamphor XIV in high yield; XIV was synthesized by deuteration of dehydronorcamphor XVI, On the basis of this evidence and previously obtained kinetic data, the phosphorylated triazoline intermediate formed initially from I and II is postulated to decompose by a highly concerted process in which hydrogen is transferred from C-2 to C-3 in conversion to VI without any major skeletal rearrangement
N-Functionalized C-fluoroalkyl amidines are attracting great attention due to their potential in pharmaceuticals. Herein, we report a Pd-catalyzed tandem reaction of azide with isonitrile and fluoroalkylsilane via a carbodiimide intermediate, providing facile access to N-functionalized C-fluoroalkyl amidines. This protocol offers an approach toward not only N-sulphonyl, N-phosphoryl, N-acyl, and N-aryl
N-官能化的 C-氟烷基脒因其在药物中的潜力而备受关注。在此,我们报道了 Pd 催化的叠氮化物与异腈和氟烷基硅烷通过碳二亚胺中间体的串联反应,提供了对 N-官能化 C-氟烷基脒的简便途径。该协议提供了一种方法,不仅可以用于 N-磺酰基、N-磷酰基、N-酰基和 N-芳基,还可以用于具有广泛底物范围的C-CF 3、C 2 F 5和 CF 2 H 脒。在克规模和生物学评估中进一步转化和 Celebrex 衍生化的完成揭示了该策略的重要效用。