Synthesis and subsequent reactivity of 1-amino-2-aza-1,3-butadienes derived from β-amino esters
摘要:
A high yield preparation of 1-amino-2-aza-1,3-butadienes derived from beta-amino esters from N-unsubstituted amidines and acetylenic esters is described. These substrates are efficient starting material for the preparation of dihydrotriazines and 5-amino pyrrolidin-3-ones. (c) 2006 Elsevier Ltd. All rights reserved.
Charge Effects in PCP Pincer Complexes of Ni<sup>II</sup>bearing Phosphinite and Imidazol(i)ophosphine Coordinating Jaws: From Synthesis to Catalysis through Bonding Analysis
This contribution reports on a new family of NiII pincercomplexes featuring phosphinite and functional imidazolyl arms. The proligands RPIMCHOPR′ react at room temperature with NiII precursors to give the corresponding complexes [(RPIMCOPR′)NiBr], where RPIMCOPR=κP,κC,κP‐2‐(R′2PO),6‐(R2PC3H2N2)C6H3}, R=iPr, R′=iPr (3 b, 84 %) or Ph (3 c, 45 %). Selective N‐methylation of the imidazole imine moiety
该论文报道了一个新的Ni II钳形复合物家族,该复合物具有次膦酸酯和功能性咪唑基臂。所述前配体- [R PIMC ħ OP R'在室温下用Ni反应II [(前体,得到相应的配合物[R PIMCOP R' NIBR,其中)] - [R PIMCOP - [R =κ P,κ Ç,κ P 2-(R - ′ 2 PO),6-(R 2 PC 3 H 2 N 2)C 6 H 3 },R = i Pr,R'=i Pr(3 b,84%)或Ph(3 c,45%)。通过MeOTf(OTf = OSO 2 CF 3)对3 b中的咪唑亚胺部分进行选择性N-甲基化,得到相应的咪唑并膦[[ i Pr PIMIOCOP i Pr)NiBr] [OTf],4 b,产率89%(i Pr PIMIOCOP我镨=κ P,κ ç,κ P - 2-(我镨2 PO),6-(我镨2 PC 4 ħ 5 ñ2)C 6 H 3 })。治
Copper(I)-induced addition of amines to unactivated nitriles: The first general one-step synthesis of alkyl amidines.
Cu(I)Cl promotes the condensation of acetonitrile1a and benzonitrile1b with primary and secondary amines2a-g into amidines3a-j under mild conditions, in high to quantitative yields. Stoichiometric formation of Cu(I)-amidines complexes allows to control the degree of substitution of resulting amidines.
Combination of air/moisture/ambient temperature compatible organolithium chemistry with sustainable solvents: selective and efficient synthesis of guanidines and amidines
lithium amides [LiN(H)R] (obtained via an acid–base reaction between n-BuLi and the desired primaryamine) into carbodiimides (R–NCN–R) or nitriles (R–CN) has been studied, for the first time, in 2-MeTHF or CPME as ethereal green solvents, at room temperature and in the absence of a protecting atmosphere (i.e., under air/moisture), reactionconditions that are generally forbidden in the field of highly-reactive
Addition of Amines to Nitriles Catalyzed by Ytterbium Amides: An Efficient One-Step Synthesis of Monosubstituted <i>N</i>-Arylamidines
作者:Junfeng Wang、Fan Xu、Tao Cai、Qi Shen
DOI:10.1021/ol702739c
日期:2008.2.1
A one-step synthesis of monosubstituted N-arylamidinates via addition of amines to nitriles catalyzed by ytterbium amides is reported. The reactions with various substrates give the products in good to excellent yields with 5 mol % ytterbium at 100 degrees C under solvent-free conditions.
Oxley et al., Journal of the Chemical Society, 1947, p. 1110,1116