Rhodium-Catalyzed Asymmetric Coupling Reaction of Allylic Ethers with Arylboronic Acids
作者:Hiroyoshi Kiuchi、Dai Takahashi、Kenji Funaki、Tetsuo Sato、Shuichi Oi
DOI:10.1021/ol3019902
日期:2012.9.7
An asymmetric allylic substitution of simple allylic ethers with arylboronicacids in the presence of a rhodium(I)/(R)-DTBM-SEGPHOS catalyst has been developed. The reactions proceeded smoothly at room temperature to give the corresponding branch products with excellent regioselectivities and good to excellent enantioselectivities.
Bis-maleimide compounds of the formula: ##STR1## where R' is an alkenylene or alkylene group; the R" groups are independently hydrocarbon or halohydrocarbon groups; and n is an integer, are hydrolytically stable compounds which may be thermally cured, or co-cured with other radically cureable monomers, to provide crosslinked polymer with good thermal properties. Compounds of the formula where n is above about 9 can be used as additives for radically cureable silicone formulations.