Streamlined Catalytic Enantioselective Synthesis of α-Substituted β,γ-Unsaturated Ketones and Either of the Corresponding Tertiary Homoallylic Alcohol Diastereomers
作者:Juan del Pozo、Shaochen Zhang、Filippo Romiti、Shibo Xu、Ryan P. Conger、Amir H. Hoveyda
DOI:10.1021/jacs.0c08732
日期:2020.10.21
applicable, practical, and scalable strategy for efficient and enantioselectivesynthesis of β,γ-unsaturated ketones that contain an α-stereogenic center is disclosed. Accordingly, aryl, heteroaryl, alkynyl, alkenyl, allyl, or alkyl ketones that contain an α-stereogenic carbon with an alkyl, an aryl, a benzyloxy, or a siloxy moiety can be generated from readily available starting materials and by the use of
Stereoselective preparation of methylenecyclobutane-fused angular tetracyclic spiroindolines via photosensitized intramolecular [2+2] cycloaddition with allene
作者:Noriyoshi Arai、Takeshi Ohkuma
DOI:10.1016/j.tetlet.2019.151252
日期:2019.11
Irradiation of 3-(hexa-4,5-dienyl)indole derivatives in the presence of 3',4'-dimethoxyacetophenone by a high-pressure mercury lamp through Pyrex glass gave the corresponding [2+2] cycloaddition products stereoselectively in high yields. The major product was a methylenecyclobutane-fused angular tetracyclic spiroindoline derivative produced by the [2+2] cycloaddition through a parallel orientation
Access to Functionalized <i>E</i>-Allylsilanes and <i>E</i>-Alkenylsilanes through Visible-Light-Driven Radical Hydrosilylation of Mono- and Disubstituted Allenes
作者:Yanyao Cai、Wenxuan Zhao、Shaozhong Wang、Yong Liang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.9b03679
日期:2019.12.20
visible-light-driven radical hydrosilylation of allene has been achieved by using eosin Y as the photocatalyst, with thiol and base as additives. Depending on allenes, two types of adducts with E-selectivity were obtained. It was demonstrated that monosubstituted nonarylated allenes reacted to give linear E-allylsilanes, while 1,3-disubstituted electron-deficient allenes afforded E-alkenylsilanes. A radical mechanism
Method of potentiating cell-mediated immunity utilizing polyamine
申请人:Merrell Pharmaceuticals, Inc.
公开号:US05719193A1
公开(公告)日:1998-02-17
This invention relates to a method of potentiating cell-mediated immunity which comprises administering to a patient a cell-mediated immunity potentiating amount of a compound of the formula: RHN--Z--NH--(CH.sub.2).sub.m --NH--Z--NHR or a pharmaceutically acceptable salt thereof, wherein m is an integer 3 to 12, Z is a saturated C.sub.2 -C.sub.6 alkylene moiety of straight or branched chain configuration, each R group is independently H, a C.sub.1 -C.sub.6 saturated or unsaturated hydrocarbyl, or --(CH.sub.2).sub.x --(Ar)--X wherein X is H, C.sub.1 -C.sub.6 alkoxy, halogen, C.sub.1 -C.sub.4 alkyl, or --S(O).sub.x R.sub.1, x is an integer 0, 1 or 2, and R.sub.1 is C.sub.1 -C.sub.6 alkyl.