[4+2] Cycloaddition of o-Xylylenes with Imines Using Palladium Catalyst
摘要:
The cycloaddition of o-(silylmethyl)benzylic carbonates with imines proceeded in the presence of the Pd(eta(3)-C3H5)Cp-DPPPent catalyst, affording the tetrahydroisoquinolines in good to high yields. The reaction rate was remarkably increased by a fluoride additive. In the catalytic cycloaddition, the palladium(0) reacted with the benzylic substrate to form 2-palladaindane, which works as an o-xylylene equivalent. The catalytic reaction is equivalent to the hetero-Diets-Alder reaction of o-xylylene with imines.
[4+2] Cycloaddition of o-Xylylenes with Imines Using Palladium Catalyst
摘要:
The cycloaddition of o-(silylmethyl)benzylic carbonates with imines proceeded in the presence of the Pd(eta(3)-C3H5)Cp-DPPPent catalyst, affording the tetrahydroisoquinolines in good to high yields. The reaction rate was remarkably increased by a fluoride additive. In the catalytic cycloaddition, the palladium(0) reacted with the benzylic substrate to form 2-palladaindane, which works as an o-xylylene equivalent. The catalytic reaction is equivalent to the hetero-Diets-Alder reaction of o-xylylene with imines.
Palladium-Catalyzed [4 + 2] Cycloaddition of <i>o</i>-(Silylmethyl)benzyl Esters with Ketones: An Equivalent to Oxo-Diels−Alder Reaction of <i>o</i>-Xylylenes
作者:Satoshi Ueno、Masakazu Ohtsubo、Ryoichi Kuwano
DOI:10.1021/ol101792a
日期:2010.10.1
o-(Silylmethyl)benzyl carbonates reacted with various electron-deficient ketones in the presence of a palladium catalyst, affording the [4 + 2] cycloaddition products, isochromanes, in high yields. The palladium-catalyzed cycloaddition is equivalent to the oxo-Diels−Alder reaction of o-xylylene with ketones. The regioselectivities were extraordinarily affected by the structures of the o-xylylene precursors
[4+2] Cycloaddition of <i>o</i>-Xylylenes with Imines Using Palladium Catalyst
作者:Satoshi Ueno、Masakazu Ohtsubo、Ryoichi Kuwano
DOI:10.1021/ja905988e
日期:2009.9.16
The cycloaddition of o-(silylmethyl)benzylic carbonates with imines proceeded in the presence of the Pd(eta(3)-C3H5)Cp-DPPPent catalyst, affording the tetrahydroisoquinolines in good to high yields. The reaction rate was remarkably increased by a fluoride additive. In the catalytic cycloaddition, the palladium(0) reacted with the benzylic substrate to form 2-palladaindane, which works as an o-xylylene equivalent. The catalytic reaction is equivalent to the hetero-Diets-Alder reaction of o-xylylene with imines.