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Asymmetric Michael addition of a recyclable chiral amine: inversion of stereoselectivity caused by the difference of ethereal solvents

ISSN:1523-7060
2008年第10卷第13期
Node M,Hashimoto D,Katoh T,Ochi S,Ozeki M,Watanabe T,Kajimoto T Node Manabu,Hashimoto Daisuke,Katoh Takahiro,Ochi Shunsuke,Ozeki Minoru,Watanabe Tsunefumi,Kajimoto Tetsuya

The Michael addition of a chiral amine [(-)- 6] to alpha,beta-unsaturated esters ( 4) was attained and the stereoselectivity was inverted by changing the solvent from diethyl ether to tetrahydrofuran when alpha,beta-unsaturated esters having an aromatic ring at the beta-position were employed. In addition, the chiral auxiliary in the Michael adducts ( 9A) was facilely removed with N-iodosuccinimide to afford beta-amino esters ( 10A) and 2-methoxy- d-bornylaldehyde ( 11), which can be reclaimed to the chiral amine ( 6) by reductive amination.

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ISSN:1523-7060
2008年第10卷第13期

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