Unified Approach to Furan Natural Products via Phosphine‐Palladium Catalysis
作者:Violet Yijang Chen、Ohyun Kwon
DOI:10.1002/anie.202015232
日期:2021.4.12
the construction of tetraalkyl furans remains non‐trivial. The prevalence of alkyl groups in bioactive furan natural products, combined with the desirable bioactivities of tetraalkyl furans, calls for a general synthetic protocol for polyalkyl furans. This paper describes a Michael–Heck approach, using sequential phosphine‐palladium catalysis, for the preparation of various polyalkyl furans from readily
Kinetic Resolution and Dynamic Kinetic Resolution of γ‐Aryl‐Substituted Butenolides via Copper‐Catalyzed 1,4‐Hydroboration
作者:Soyeon Lee、Do Hyun Ryu、Jaesook Yun
DOI:10.1002/adsc.202001353
日期:2021.4.27
Kinetic resolution (KR) and dynamic kinetic resolution (DKR) of γ‐aryl and heteroaryl‐substitutedbutenolides via CuH‐catalyzed 1,4‐hydroboration using pinacolborane is reported. With a copper‐Ph‐BPE catalyst, selectivity factors were extremely high (s=>400) with regard to the kinetic resolution of β‐methyl‐γ‐phenyl butenolide; DKR was possible in the presence of an amine base (DBU), which facilitated racemization
SUBSTITUTED CYANO CYCLOALKYL PENTA-2,4-DIENES, CYANO CYCLOALKYL PENT-2-EN-4-YNES, CYANO HETEROCYCLYL PENTA-2,4-DIENES AND CYANO HETEROCYCLYL PENT-2-EN-4-YNES AS ACTIVE SUBSTANCES
申请人:BAYER CROPSCIENCE AKTIENGESELLSCHAFT
公开号:US20170210701A1
公开(公告)日:2017-07-27
The invention relates to cyano cycloalkyl penta-2,4-dienes, cyano cycloalkyl pent-2-en-4-ynes, cyano heterocyclyl penta-2,4-dienes and cyano heterocyclyl pent-2-en-4-ynes of general formula (I), or the salts thereof, where [X-Y], Q, R
1
, R
2
, A
1
, A
2
, V, W, m and n have the definitions specified in the description. The invention also relates to a production method for same and to the use of same for increasing stress tolerance in plants against abiotic stress, and/or for increasing the plant yield.
Efficient Trifluoromethylation of Activated and Non-Activated Alkenyl Halides by Using (Trifluoromethyl)trimethylsilane
作者:Andreas Hafner、Stefan Bräse
DOI:10.1002/adsc.201100528
日期:2011.11
An efficient method for the trifluoromethylation of halogenated double bonds by using in situ generated “trifluoromethyl copper” is described. Herein, the most common trifluoromethyl source, (trifluoromethyl)trimethylsilane, was converted selectively into “trifluoromethyl copper” by using copper iodide as copper source and potassium fluoride as promoter. In 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone
Insights into the in Vitro and in Vivo SAR of Abscisic Acid - Exploring Unprecedented Variations of the Side Chain via Cross-Coupling-Mediated Syntheses
Herein, we disclose a series of novel abscisic acid derivatives exhibiting strong effects in vitro and in vivo against drought stress in crops, particularly canola and wheat. Promising effects were also observed in corn and barley. Our combined in vivo/in vitro structure‐activity relationship (SAR) study is corroborated by results from crystal structure analyses and receptor specificity tests.