手性C 2 -对称 3,3'-二氨基甲基-联萘酚 ( AMB ) 是一种用于三取代丙烯腈不对称环氧化的有机催化剂。使用氢过氧化枯烯 (CHP) 作为氧化剂,3,3'-双(( R , R )-2-苯乙基氨基甲基)-( R )-联萘酚( AMB2 )在 - 30 °C 得到手性环氧化物作为单一非对映异构体,对映选择性范围为 15% ee 至 97% ee。
A remote β,γ-regioselective asymmetric inverse-electron-demand oxa-Diels–Alder reaction between allylic ketones and α-cyano-α,β-unsaturated ketones has been developed through induced extended dienamine catalysis of a cinchona-derived primary amine. A spectrum of densely substituted dihydropyran frameworks were efficiently produced with excellent enantioselectivity and fair to exclusive diastereoselectivity
cyclic 2,4-dienones is adopted to deliver γ′,δ-regioselective [4 + 2] cycloadducts catalyzed by cinchona-derived amines. In addition, a diastereodivergent [4 + 2] cycloadditionreaction is realized with Z-configured 4-alkylideneisoxazol-5(4H)-ones under similar catalytic conditions, even through a three- or four-component cascade process with simple starting materials.
While phosphine-mediated reactions have been extensively explored over the past few decades, the catalytic cyclopropanation reaction via a phosphonium ylide pathway has been significantly underdeveloped, and an intermolecular version still remains to be disclosed. Presented herein is a catalytic cyclopropanation reaction between readily available benzylbromides and activated alkenes, such as α-cyano
IBX-Mediated Dehydrogenation of Substituted β-Oxonitriles
作者:Philipp Klahn、Stefan F. Kirsch
DOI:10.1002/ejoc.201402007
日期:2014.5
convenient method for the mild dehydrogenation of β-oxonitriles is presented. When treated with o-iodoxybenzoic acid (IBX), a range of these compounds were transformed into their unsaturated counterparts. Furthermore, we show that the products of the dehydrogenation can react in situ, undergoing rapid hetero-Diels–Alder reactions with enol ethers to give multiply substituted dihydropyrans. We also describe
Chiral Aminomethylbinaphthol‐Catalyzed Diastereo‐ and Enantioselective Epoxidation of Trisubstituted Acrylonitriles
作者:Eri Ogino、Satoru Kuwano、Takayoshi Arai
DOI:10.1002/adsc.202200036
日期:2022.4.12
3′-bisaminomethyl-binaphthol (AMB) is an organocatalyst for the asymmetric epoxidation of trisubstituted acrylonitriles. Using cumene hydroperoxide (CHP) as an oxidant, 3,3′-bis((R,R)-2-phenylethylaminomethyl)-(R)-binaphthol (AMB2) catalyzed epoxidation of trans-2-aroyl-3-arylacrylonitriles at −30 °C to give the chiral epoxides as a single diastereomer with enantioselective manner ranging from 15% ee to 97%
手性C 2 -对称 3,3'-二氨基甲基-联萘酚 ( AMB ) 是一种用于三取代丙烯腈不对称环氧化的有机催化剂。使用氢过氧化枯烯 (CHP) 作为氧化剂,3,3'-双(( R , R )-2-苯乙基氨基甲基)-( R )-联萘酚( AMB2 )在 - 30 °C 得到手性环氧化物作为单一非对映异构体,对映选择性范围为 15% ee 至 97% ee。