O-炔丙基β-酮酸酯和O-烯丙基β-酮酸酯的高效催化不对称克莱森重排反应是在温和的反应条件下完成的。在存在手性N,N'-二氧化物/ Ni II配合物的情况下,通常以良好的收率(高达99%)和高的非对映选择性(高达90%)获得各种各样的烯丙基/烯丙基取代的全碳季β-酮酸酯。至99:1 dr)的对映选择性(高达99%ee)。
Metal-Free Catalytic Asymmetric Fluorination of Keto Esters Using a Combination of Hydrogen Fluoride (HF) and Oxidant: Experiment and Computation
作者:Roman Pluta、Patricia E. Krach、Luigi Cavallo、Laura Falivene、Magnus Rueping
DOI:10.1021/acscatal.7b03118
日期:2018.3.2
for the catalytic asymmetric fluorination has been developed. The catalyst was used in the asymmetric fluorination of carbonyl compounds, providing the products with a quaternary stereocenter with high enantioselectivities. Chiral hypervalent iodine difluoride intermediates were generated in situ by treatment of the catalyst with an oxidant and hydrogen fluoride as fluoride source. As such, the α-fluorination
The enantioselective Claisenrearrangement of allenyl vinyl ethers was realized to access branched 1,3-dienyl-substituted all-carbon quaternary stereocenters using a NiII-N,N[prime or minute]-dioxide complex.
实现了烯基乙烯基醚的对映选择性克莱森重排,以使用Ni II - N,N [伯或分钟]-二氧化物络合物接近支链的1,3-二烯基取代的全碳季立体中心。
The direct electrophilic cyanation of β-keto esters and amides with cyano benziodoxole
The development of a direct ylide transfer to carbonyl derivatives and of a sulfoxide-mediated arylation is presented from a unified perspective. Mechanistic studies (including density functional calculations) support a common reaction pathway and showcase how subtle changes in reactant properties can lead to disparate and seemingly unrelated reaction outcomes.
STRIGOLACTAM DERIVATIVES AS PLANT GROWTH REGULATING COMPOUNDS
申请人:Syngenta Participations AG
公开号:US20140302993A1
公开(公告)日:2014-10-09
The present invention relates to novel strigolactam derivatives of formula (I), to processes and intermediates for preparing them, to plant growth regulator compositions comprising them and to methods of using them for controlling the growth of plants and/or promoting the germination of seeds.