Asymmetry induction on the [4C(4π)+3C(2π)] cycloaddition reaction of C2-functionalized furans: influence of the chiral auxiliary nature
摘要:
The study of the pi-facial diastereoselectivity in the [4+3] cycloaddition reaction of thirteen different chiral 2-substituted furans with oxyallyl cations, under sonochemical and/or thermal conditions, is presented. In almost all studied furans, a cis diastereoselectivity and a high endo diastereoselectivity is observed. Decreasing the distance between the closest stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, increases the pi-facial diastereoselectivity, especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetry induction on the [4C(4π)+3C(2π)] cycloaddition reaction of C2-functionalized furans: influence of the chiral auxiliary nature
摘要:
The study of the pi-facial diastereoselectivity in the [4+3] cycloaddition reaction of thirteen different chiral 2-substituted furans with oxyallyl cations, under sonochemical and/or thermal conditions, is presented. In almost all studied furans, a cis diastereoselectivity and a high endo diastereoselectivity is observed. Decreasing the distance between the closest stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, increases the pi-facial diastereoselectivity, especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.
Induction of asymmetry on the [4+3] cycloaddition reaction of C2-functionalized furans
作者:Angel M Montaña、Pedro M Grima
DOI:10.1016/s0040-4039(02)00199-5
日期:2002.3
A study of the induction of asymmetry on the [4+3] cycloaddition reaction of some 13 C2-substituted furan derivatives with 2-oxyallyl cation is presented. The asymmetry was induced by a chiral auxiliary on C2 of furan. A vis diastereospecificity and a high endo diastereoselectivity are observed in almost all studied cases. On decreasing the distance between the stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, the pi-facial diastereoselectivity is increased. especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetry induction on the [4C(4π)+3C(2π)] cycloaddition reaction of C2-functionalized furans: influence of the chiral auxiliary nature
作者:Angel M Montaña、Pedro M Grima
DOI:10.1016/s0040-4020(02)00452-0
日期:2002.6
The study of the pi-facial diastereoselectivity in the [4+3] cycloaddition reaction of thirteen different chiral 2-substituted furans with oxyallyl cations, under sonochemical and/or thermal conditions, is presented. In almost all studied furans, a cis diastereoselectivity and a high endo diastereoselectivity is observed. Decreasing the distance between the closest stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, increases the pi-facial diastereoselectivity, especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.