Palladium-Catalyzed Asymmetric Nitrogen-Selective Addition Reaction of Indoles to Alkoxyallenes
作者:Seok Hyeon Jang、Hyun Woo Kim、Wook Jeong、Dohyun Moon、Young Ho Rhee
DOI:10.1021/acs.orglett.8b00191
日期:2018.2.16
A new palladium-catalyzed asymmetricadditionreaction of indoles to alkoxyallenes is reported. Remarkably, the reaction showed complete regioselectivity toward the nitrogen. A new mechanism distinct from that of conventional π-allyl chemistry is proposed to explain this unique selectivity. The utility of the reaction is demonstrated by highly efficient and flexible synthesis of N-glycosylindoles.
Diversity-Oriented Synthesis of Carbohydrate Scaffolds through the Prins Cyclization of Differently Protected<scp>d</scp>-Mannitol-Derived Homoallylic Alcohols
作者:Sateesh Dubbu、Yashwant D. Vankar
DOI:10.1002/ejoc.201701172
日期:2017.11.2
scaffolds such as sugar fused isochroman derivatives, bicyclic vinyl halide derivatives, fluorine substituted tetrahydropyrans, and a furan derivative is reported. This has been achieved by using the Prins reaction on D-mannitol derived homoallylic alcohols in which the allylic alcohol is differently protected and that causes structural variations in products. Some of the products have also been converted
Access to chiral homoallylic vicinal diols from carbonyl allylation of aldehydes with allyl ethers via palladium-catalyzed allylic C-H borylation
作者:Tian-Ci Wang、Pu-Sheng Wang、Dian-Feng Chen、Liu-Zhu Gong
DOI:10.1007/s11426-021-1134-x
日期:2022.2
Chiral homoallylic vicinal diols are found in many bioactive compounds and are among the most versatile functional groups in organic chemistry. Here, we describe an asymmetric carbonyl allylation of aldehydes with allyl ethers proceeding via allylic C-H borylation enabled by palladium and chiral phosphoric acid sequential catalysis, providing facile access to homoallylic vicinal anti-diols in high
手性同烯丙基邻二醇存在于许多生物活性化合物中,是有机化学中用途最广泛的官能团之一。在这里,我们描述了具有烯丙基醚在进行醛的不对称羰基烯丙基经由烯丙基的CH硼化由钯和手性磷酸顺序催化启用,提供对以高产率和具有优异的立体选择性高烯丙基邻抗二醇容易访问。该协议使 aigialomycin D 的全合成能够在 7 个步骤内完成。
Anomeric sugar boronic acid analogues as potential agents for boron neutron capture therapy
作者:Daniela Imperio、Erika Del Grosso、Silvia Fallarini、Grazia Lombardi、Luigi Panza
DOI:10.3762/bjoc.15.135
日期:——
of accelerators as neutron source, the access to new suitable agents for boron neutron capture therapy (BNCT) became a major need. Among many others, sugar boronicacids have recently attracted attention as boron carriers. Herein we report the synthesis and preliminary biological studies of two new sugar analogues containing a boronicacid at the anomeric position. The analogues were obtained by hydroboration
Synthesis of erythro and threo furanoid glycals using 5-endo-trig selenoetherification as key step
作者:Fernando Bravo、Mohamed Kassou、Sergio Castillón
DOI:10.1016/s0040-4039(98)02561-1
日期:1999.2
Differently protected erythro and three furanoid glycals were synthesised from 4-pentene-1,2,3-triol, through selenium induced 5-endo-trig cyclization and selenoxide elimination. (C) 1999 Elsevier Science Ltd. All rights reserved.