NMR analysis of chiral alcohols and amines: development of an environmentally benign “in tube” procedure with high efficiency and improved detection limit
作者:Nikolay V. Orlov、Valentine P. Ananikov
DOI:10.1039/c1gc15191f
日期:——
NMR analysis of chiral alcohols and amines using readily available enantiopure MPA (α-methoxy-α-phenylacetic acid) and MTPA (α-methoxy-α-trifluoromethylphenylacetic acid) as chiralderivatizingagents. The procedure requires less than 5 min (including sample preparation time) for analysis using routine NMR hardware and allows accurate measurements for <0.01 mg of the sample of chiral compounds. Direct
Facile and purification free synthesis of Mosher amides utilizing a ROMPgel supported reagent
作者:Thomas Arnauld、Anthony G.M Barrett、Brian T Hopkins、Frédéric J Zécri
DOI:10.1016/s0040-4039(01)01724-5
日期:2001.11
A novel ROMPgel immobilized active ester for the purification free synthesis of Mosheramides is described.
描述了一种新颖的ROMPgel固定的活性酯,用于无纯化的Mosher酰胺的合成。
Expeditious synthesis of mosher amides using a solid supported carbodiimide
作者:Maciej Adamczyk、Jeffrey R. Fishpaugh
DOI:10.1016/0040-4039(96)01617-6
日期:1996.9
A novel method of Mosher amide synthesisusing a solidsupportedcarbodiimide in CDCl3 is described. Estimation of optical purity can be promptly achieved by direct NMR analysis of the reaction solvent.
Asymmetric synthesis of amines using a chiral, non-racemic, benzylidene sulfinamide derived from a recoverable precursor
作者:David R. J. Hose、Mary F. Mahon、Kieran C. Molloy、Tony Raynham、Martin Wills
DOI:10.1039/p19960000691
日期:——
diastereoselective reduction and hydrolysis S(s)R-(+)-1 can be recycled in one step from the sulfinic acid 11. The addition of zinc(II) bromide reverses the diastereoselectivity of the diisobutylaluminium hydride (DIBAL) reduction of the substrates 4. The same reversal is not observed in the reactions of analogues lacking an amide side chain. In one case the required benzylidene sulfinamide exists in the form of an
高手性环状亚磺酰胺S (s) R -(+)-1已用于通过亚苄基亚磺酰胺R (s) R-(-)-4不对称合成α-取代的苄胺。以下非对映选择性还原和水解小号(S) - [R - (+) - 1可以从亚磺酸11.加入锌中的一个步骤被回收(II溴化物逆转了底物4的氢化二异丁基铝(DIBAL)还原的非对映选择性。在缺乏酰胺侧链的类似物的反应中未观察到相同的逆转。在一种情况下,所需的亚苄基亚磺酰胺以烯胺15的形式存在,其X射线晶体结构也具有特征。还描述了通过将格氏试剂添加到衍生自S (s) R -(+)-1的亚硫胺中来制备手性胺的第二种方法。