Reductive elimination of alkylpalladium formate intermediates formed in enyne cyclizations
摘要:
Various enynes under the palladium catalysts,were successfully cyclized to the alkylpalladium intermediates, which then were reduced by the hydrogen in a formate ligand (C) 1999 Elsevier Science Ltd. All rights reserved.
Iron-Promoted Difunctionalization of Alkenes by Phenylselenylation/1,2-Aryl Migration
作者:Ping Wu、Kaikai Wu、Liandi Wang、Zhengkun Yu
DOI:10.1021/acs.orglett.7b02751
日期:2017.10.6
Iron-promoted difunctionalization of α,α-diaryl and α-aryl-α-alkyl allylic alcohols has been efficiently achieved by means of N-(phenylseleno)phthalimide (N-PSP) under mild conditions. An in situ generated phenylselenium cation (PhSe+) was added to the olefinic C═C bond to initiate the regioselective phenylselenylation with concomitant 1,2-aryl migration, following a migration preference contrary to
Electrochemical Oxidative Aryl(alkyl)trifluoromethylation of Allyl Alcohols via 1,2-Migration
作者:Zhipeng Guan、Huamin Wang、Yange Huang、Yunkun Wang、Shengchun Wang、Aiwen Lei
DOI:10.1021/acs.orglett.9b01518
日期:2019.6.21
An electrochemical oxidative difunctionalization of allyl alcohols for the synthesis of β-trifluoromethyl ketones is achieved through a 1,2-migration process. A series of β-trifluoromethyl ketones can be facilely obtained utilizing CF3SO2Na as a radical source, eliminating the use of metals and sacrificial chemical oxidants. Importantly, this protocol not only realizes aryl migration but also offers
通过1,2-迁移过程可实现烯丙醇的电化学氧化双官能化,以合成β-三氟甲基酮。利用CF 3 SO 2 Na作为自由基源可以轻松获得一系列β-三氟甲基酮,而无需使用金属和牺牲性化学氧化剂。重要的是,该协议不仅实现了芳基迁移,而且还提供了烷基迁移产物。另外,电化学催化的环膨胀和克级反应证明了该方案的合成有用性。
PERFUMING INGREDIENTS OF THE FLORAL AND/OR ANIS TYPE
申请人:Moretti Robert
公开号:US20110200546A1
公开(公告)日:2011-08-18
The present invention concerns a compound of formula wherein R represents a hydrogen atom or a C
1-2
alkyl or alkoxyl group; each R
1
, R
2
or R
3
represents a hydrogen atom or a methyl or ethyl group; and X represents a CHO, COOR
4
or CN group, R
4
being a methyl or ethyl group; and at least one of said R, R
1
or R
2
represents a group containing at least one carbon atom; and it use as perfuming ingredient, for instance to impart odor notes of the floral and/or anis type.
Improvements and Applications of the Transition Metal-Free Asymmetric Allylic Alkylation using Grignard Reagents and Magnesium Alanates
作者:David Grassi、Alexandre Alexakis
DOI:10.1002/adsc.201500495
日期:2015.10.12
Two new N-heterocyclic carbene (NHC) ligands have been synthesized and employed in the transition metal-free asymmetric allylic alkylation (AAA) mediated by Grignardreagents and magnesium alanates. The employment of these ligands showed high yields and improved regio- and enantioselectivity in the formation of tertiary and quaternary stereocenters. Moreover, the low catalyst loading (up to 0.3 mol%)
Regio‐ and Enantioselective Preparation of Chiral Allylic Sulfones Featuring Elusive Quaternary Stereocenters
作者:Aijie Cai、Arjan W. Kleij
DOI:10.1002/anie.201908318
日期:2019.10.14
We describe here the first general asymmetric synthesis of sterically encumbered α,α-disubstituted allylic sulfones via Pd-catalyzed allylicsubstitution. The design and application of a new and highly efficient phosphoramidite ligand (L10) proved to be crucial, and a wide variety of challenging allylic sulfones featuring quaternary stereocenters could be obtained in good yields and with good to excellent