An expedient approach to E,Z-dienes using the Julia olefination
摘要:
New reaction conditions were developed for the synthesis of E,Z-dienes from alpha,beta -unsaturated aldehydes and heteroarylsurfones using the Julia reaction. In most cases under optimal conditions, the selectivity of the olefination reaction is better than 88:12 when a pyridylsulfone was used as the precursor. In addition, novel reaction conditions for the chemoselective oxidation of heteroarylthioethers that are compatible with alkenes and dienes are also reported. (C) 2001 Elsevier Science Ltd. All rights reserved.
Enantioselective Claisen Rearrangements with a Hydrogen-Bond Donor Catalyst
作者:Christopher Uyeda、Eric N. Jacobsen
DOI:10.1021/ja803370x
日期:2008.7.1
m ion associated with the noncoordinating BArF counterion is shown to be an effective catalyst for the [3,3]-sigmatropic rearrangement of a variety of substitutedallylvinylethers. Highly enantioselective catalytic Claisenrearrangements of ester-substituted allylvinylethers are then documented using a new C2-symmetric guanidinium ion derivative.
Synthesis of Amides and Lactams in Supercritical Carbon Dioxide
作者:Xiao Yin Mak、Rocco P. Ciccolini、Julia M. Robinson、Jefferson W. Tester、Rick L. Danheiser
DOI:10.1021/jo9021875
日期:2009.12.18
ethoxy alkynes are performed at 120−130 °C, whereas tert-butoxy derivatives undergo the retro-ene reaction at 90 °C. With the exception of primary, unbranched amines, potential side reactions involving addition of the amines to carbon dioxide are not competitive with the desired C−N bond-forming reaction. The amide synthesis is applicable to the preparation of β-hydroxy and β-amino amide derivatives
[EN] NOVEL DERIVATIVES OF OXAZAPHOSPHORINES AND THERAPEUTIC USES THEREOF<br/>[FR] NOUVEAUX DÉRIVÉS D'OXAZAPHOSPHORINES ET LEUR UTILISATION THÉRAPEUTIQUE
申请人:ROUSSY INST GUSTAVE
公开号:WO2015173367A1
公开(公告)日:2015-11-19
The present invention relates to novel derivatives of oxazaphosphorines, pharmaceutical compositions and therapeutic use thereof, in particular for treating or preventing cancer.
本发明涉及新型氧氮磷酸酯衍生物,以及其药物组合物和治疗用途,特别是用于治疗或预防癌症。
Efficient Procedures to Prepare Primary and Secondary Alkyl Halides from Alkanols via the Corresponding Sulfonates under Mild Conditions
herein shows that sulfonate/halide exchange can be advantageously performed in THF to avoid several side reactions such as elimination and epimerization when the reaction is performed from a chiral alkyl sulfonate or a substrate having a CH acidic chiral center. The main limitation of this procedure was found to be the conversion of secondaryalkyl sulfonates to alkyl chlorides. In this case, the
作者:L. Alcaraz、J.J. Harnett、C. Mioskowski、J.P. Martel、T. Le Gall、Dong-Soo Shin、J.R. Falck
DOI:10.1016/s0040-4039(00)73523-4
日期:1994.7
One-carbon homologation of benzylic, allylic, propargylic and primary halides or mesylates with dimethylsulfonium methylide affords terminal olefins in good to excellent yields.