对于某些生物碱和相关药物的合成方法,β-酰胺基酯向β-烯氨基酯的转化是必不可少的步骤。用于这种转化的已知方法不仅是逐步的,而且以低原子效率进行。本文中,我们报道了一种直接且通用的方法,其特征在于用1,1,3,3-四甲基二硅氧烷(TMDS)进行Ir催化的β-酰胺基酯的化学选择性还原。另外,在某些脂环族β-烯胺酯的13 C NMR光谱中观察到缺少某些信号。这揭示了文献中长期存在但被忽略的现象。
The acyl group of an alpha-aryl-beta-keto ester was readily transferred to N-, O-, and S-nucleophiles. The transacylation from arylated diethyl 3-oxoglutarate to amines led to unsymmetrical malonic acid amide esters in high yields. The present reaction proceeded under mild conditions without formation of detectable byproducts. Only simple experimental manipulations were required. This reaction was also found to be sensitive to steric factors, which enabled the chemoselective monoacylation of diamines and amino alcohols without any modifications such as protection.
Synthesis of diversely functionalised 2,2-disubstituted oxetanes: fragment motifs in new chemical space
作者:Owen A. Davis、Rosemary A. Croft、James A. Bull
DOI:10.1039/c5cc05740j
日期:——
Novel oxetane motifs incorporating diverse functional groups on the ring are readily accessed by an O–H insertion/cyclisation strategy.
新颖的氧杂环结构,其中环上包含多种功能基团,可以通过氧-氢插入/环化策略轻松获得。
NOVEL USES OF ESTERAMIDE COMPOUNDS
申请人:Guglieri Massimo
公开号:US20130210933A1
公开(公告)日:2013-08-15
The use of an esteramide compound, alone or as a mixture of the following formula (I):
R
1
OOC-A-CONR
2
R
3
(I)
is described, wherein:
A is a covalent bond or a methylene group —CH
2
—,
R
1
is an optionally substituted hydrocarbon group having from 1 to 36 carbon atoms,
R
2
and R
3
, either identical or different, are groups selected from a hydrogen atom and optionally substituted hydrocarbon groups comprising from 1 to 36 carbon atoms,
R
2
and R
3
may form together a ring having the nitrogen atom to which they are bound, said ring being, if need be, substituted and/or having an additional heteroatom and
R
2
and R
3
not being simultaneously hydrogens.
Also described, are applications for using the esteramide compound as a solvent, a co-solvent, a coalescence agent, a crystallization inhibitor, a plasticizer or an agent for increasing biological activity.
OXIDATIVE COUPLING OF ARYL BORON REAGENTS WITH SP3-CARBON NUCLEOPHILES, AND AMBIENT DECARBOXYLATIVE ARYLATION OF MALONATE HALF-ESTERS VIA OXIDATIVE CATALYSIS
申请人:The Governors of the University of Alberta
公开号:US20180186721A1
公开(公告)日:2018-07-05
Described herein are methods of oxidative coupling of aryl boron reagents with sp
3
-carbon nucleophiles, and ambient decarboxylative arylation of malonate half-esters via oxidative catalysis.
A ‘sulfonyl-azide-free’ (SAFE) aqueous-phase diazo transfer reaction for parallel and diversity-oriented synthesis
作者:Dmitry Dar’in、Grigory Kantin、Mikhail Krasavin
DOI:10.1039/c9cc02042j
日期:——
Diazotransferreactions are notoriously associated with the use of potentially explosive sulfonyl azides. The first ‘sulfonyl-azide-free’ (SAFE) protocol for producing diazo compounds from their active-methylene precursors via the Regitz diazotransferreaction was developed and has displayed a remarkable substrate scope. It can be applied to generating arrays of diazo compounds for further evolution
New indium-mediated cyclisation reactions of tethered haloenynes in aqueous solvent systems
作者:Andres Goeta、Matthew M. Salter、Hummad Shah
DOI:10.1016/j.tet.2006.01.094
日期:2006.4
The intramolecular cyclisation of tethered allyl bromides onto terminal alkynes mediated by metallic indium proceeds smoothly and cleanly in mixtures of THF and H2O to give unsaturated carbocycles and heterocycles in good yield. Alternatively, the cyclisation may be carried out in anhydrous THF with the aid of acid catalysis. The reaction is also mediated by a range of indium salts and proceeds with