Biphenyl-Derived Phosphepines as Chiral Nucleophilic Catalysts: Enantioselective [4+1] Annulations To Form Functionalized Cyclopentenes
作者:Daniel T. Ziegler、Lorena Riesgo、Takuya Ikeda、Yuji Fujiwara、Gregory C. Fu
DOI:10.1002/anie.201405854
日期:2014.11.24
fully substituted stereocenter [either all‐carbon or heteroatom‐substituted (sulfur and phosphorus)]. Stereocenters at the other four positions of the cyclopentane ring can also be introduced with good stereoselectivity. An initial mechanistic study indicates that phosphine addition to the electrophilic four‐carbon coupling partner is not the turnover‐limiting step of the catalytic cycle.
Solid-phase combinatorial synthesis of 4-hydroxyquinolin-2(1H)-ones
作者:Mui Mui Sim、Cheng Leng Lee、A. Ganesan
DOI:10.1016/s0040-4039(98)01320-3
日期:1998.8
cleavage with concomitant decarboxylation produces β-keto nitriles. In the case of isatoic anhydrides, the resin-bound acylated intermediates undergo cyclative cleavage upon heating, leading to 4-hydroxyquinolin-2(1H)-ones.
N-arylbenzamide derivatives of formula (I)
wherein Z is oxygen or sulfur, R1,R2, R3 are hydrogen or a substituent, R4 is an heteroaryl group linked to the nitrogen atom by a carbon atom, selected from possibly substituted isoxazole, isothiazole, pyrazole, imidazole, thiadiazole, oxadiazole or pyridazine.
These compounds can be used as herbicides.
式(I)的 N-芳基苯甲酰胺衍生物
其中 Z 是氧或硫;R1、R2、R3 是氢或取代基;R4 是通过碳原子与氮原子相连的杂芳基,选自可能取代的异噁唑、异噻唑、吡唑、咪唑、噻二唑、噁二唑或哒嗪。
这些化合物可用作除草剂。
Moureu; Lazennec, Bulletin de la Societe Chimique de France, 1907, vol. <4> 1, p. 1065