在含不同酸的二恶烷水溶液中研究了酸催化的2,2-二甲氧基乙基膦酸二乙酯(II)和2,2,2-二甲氧基乙基膦酸二甲酯(III)的2,2-二乙氧基乙基膦酸二乙酯(I)的水解动力学。催化剂。log k 1相对于H 0的图的斜率为0.98;(log k 1 + H 0)相对于log a H 2 O的曲线的斜率W = -0.1。化合物(II)在1 M中的氘溶剂同位素效应k D / k H-硫酸在30°为2.8。根据扎克-汉米特(Zucker-Hammett)和邦内特(Bunnett)的假设,所获得的结果与A -1机制相符。在25°下测得的二阶速率常数为:对于化合物(I),k 2 3.7×10 –4 l mol –1;对于化合物(II)和(III),k 2 3.7 ×10 –4 l mol s –1。能量(15–17 kcal mol –1)和熵(–25至–27 cal mol –1 K –1)的值较
Ferrocene reacts with β-ketophosphonates and β-ketosulfones (or acetals of formylphosphonates and sulfones) in the presence of a strong acid (triflic or methanesulfonic) to afford β-ferrocenyl-α,β-unsaturated phosphonates and β-ferrocenyl-α,β-unsaturatedsulfones in good yield. The (E)-stereochemistry of these compounds was confirmed by spectral and analytical data, as well as by X-ray diffraction
Stereoselective Synthesis of the Halaven C14-C26 Fragment from<scp>D</scp>-Quinic Acid: Crystallization-Induced Diastereoselective Transformation of an α-Methyl Nitrile
作者:Francis Belanger、Charles E. Chase、Atsushi Endo、Francis G. Fang、Jing Li、Steven R. Mathieu、Annie Z. Wilcoxen、Huiming Zhang
DOI:10.1002/anie.201501143
日期:2015.4.20
Crystallization‐induced diastereoselectivetransformation (CIDT) of an α‐methyl nitrile completes an entirely non‐chromatographic synthesis of the halichondrin B C14–C26 stereochemical array. The requisite α‐methyl nitrile substrate is derived from D‐quinic acid through a series of substrate‐controlled stereoselective reactions via a number of crystalline intermediates that benefit from a rigid polycyclic
Processes for preparing quinoline derivatives and intermedias thereof
申请人:——
公开号:US20030125355A1
公开(公告)日:2003-07-03
The present invention provides a production method of quinoline derivative (V)
1
wherein each symbol is as defined in the Specification, which includes reacting quinolinecarbaldehyde (I) with any of the compounds (II) to (IV) in the presence of a base, followed by hydrolysis.
PROCESSES FOR PREPARING QUINOLINE DERIVATIVES AND INTERMEDIATES THEREOF
申请人:Kuraray Co., Ltd.
公开号:EP1262476A1
公开(公告)日:2002-12-04
The present invention provides a production method of quinoline derivative (V)
wherein each symbol is as defined in the Specification, which includes reacting quinolinecarbaldehyde (I) with any of the compounds (II) to (IV) in the presence of a base, followed by hydrolysis.
REAGENT FOR TESTING PURIFICATION CAPACITY OF RADIOACTIVE GAS IN A NUCLEAR POWER PLANT, PREPARATION METHOD THEREOF AND IODIDE FILTER TESTING EQUIPMENT USING THIS REAGENT