PALLADIUM-CATALYZED CARBONYLATIVE COUPLING OF ORGANOLEAD COMPOUNDS: SYNTHESIS OF SYMMETRICAL KETONES
作者:Suk-Ku Kang、Hyung-Chul Ryu、Sang-Chul Choi
DOI:10.1081/scc-100103533
日期:2001.1
Organolead acetates can be carbonylated in the presence of Pd2(dba)3·CHCl3 (5 mol%) and NaOMe (5 equiv.) in CH3CN under atmospheric pressure of carbon monoxide at room temperature to afford symmetrical ketones.
Enantioselective synthesis of sterically hindered α-allyl–α-aryl oxindoles via palladium-catalysed decarboxylative asymmetric allylic alkylation
作者:Mark Jackson、Calvin Quince O'Broin、Helge Müller-Bunz、Patrick J. Guiry
DOI:10.1039/c7ob02161e
日期:——
decarboxylative asymmetricallylicalkylation (DAAA) was optimized with 2,4,6-trimethoxyphenyl as the aryl-containing substrate. A screen of chiral P,N- and P,P-based ligands showed that the ANDEN-phenyl Trost ligand was the most effective, affording the corresponding α-allyl–α-aryl oxindole product in 96% yield and 99% ee. A substrate scope of a further 12 α-aryl–β-amido allyl ester substituted oxindoles showed
Palladium-catalyzed cross-coupling of organolead compounds with organostannanes
作者:Suk-Ku Kang
DOI:10.1039/a802726i
日期:——
The palladium-catalyzed cross-coupling of organolead triacetates with organostannanes has been accomplished in the presence of Pd2(dba)3·CHCl3 (5 mol%) and NaOMe (5 equiv.) in MeOH–MeCN (1:1) under mild conditions.
Enantioselective Synthesis of α-Allyl-α-aryldihydrocoumarins and 3-Isochromanones via Pd-Catalyzed Decarboxylative Asymmetric Allylic Alkylation
作者:Ramulu Akula、Patrick J. Guiry
DOI:10.1021/acs.orglett.6b02584
日期:2016.11.4
An enantioselectivePd-catalyzed DAAA of α-aryl-β-oxo esters has been developed employing the (R,R)-ANDEN-phenyl Trost ligand to prepare a series of α-aryl-α-allyldihydrocoumarins and 3-isochromanones. A variety of aryl groups were successfully employed to afford the dihydrocoumarin and 3-isochromanone products in high yields up to 95% and ee’s up to 96%. Under these conditions, substrates containing
作者:John Emsley、Lewina Y.Y. Ma、Sacha A. Karaulov、Majid Motevalli、Michael B. Hursthouse
DOI:10.1016/0022-2860(90)80322-b
日期:1990.1
Abstract The X-ray crystal structure of the title compound shows it to be the enol tautomer and with two molecules in the unit cell, with hydrogen bond lengths, R (O··O), of 2.446 and 2.474 A. These and other hydrogen bond parameters (δ, Δδ(H-D) and ν OHO ) of similar compounds are compared and attempts made to relate them to Q , which is derived from the bond asymmetry of the enol ring.
摘要 标题化合物的 X 射线晶体结构表明它是烯醇互变异构体,在晶胞中有两个分子,氢键长度 R (O··O) 为 2.446 和 2.474 A。这些和其他氢比较相似化合物的键参数(δ、Δδ(HD) 和 ν OHO ),并尝试将它们与 Q 相关联,Q 源自烯醇环的键不对称性。