Novel photoreductive cyclization of 1-aryl-2-methylpropane-1,3-diones
摘要:
Irradiation of 2-methyl-1-phenylpropane-1,3-diones 1a-c in 2-propanol gave trioxatricyclononanes 2a-c, 3a,b, and 4a. Irradiation of 1,3-diaryl-2-methylpropane-1,3-diones 1d and le gave trioxatricyclononanes 2d and 2e, dl-pinacols 5d and 5e, and the bicyclic dihemiacetal 6. The dihemiacetal 6 underwent dehydration on heating to give the trioxatricyclononane 3d. Treatment of 2d,e, 5d,e, and 6 with hydrochlolic acid gave dioxabicyclooctadienes 7a and 7b, while that of 2a-c, 3a,b and 4a with hydrochloric acid gave 3-methylenecyclopentenes 8a-c and the epoxycycloheptenone 9.
USE OF SUBSTITUTED ISOQUINOLINONES, ISOQUINOLINDIONES, ISOQUINOLINTRIONES AND DIHYDROISOQUINOLINONES OR IN EACH CASE SALTS THEREOF AS ACTIVE AGENTS AGAINST ABIOTIC STRESS IN PLANTS
申请人:Frackenpohl Jens
公开号:US20140302987A1
公开(公告)日:2014-10-09
Use of substituted isoquinolinones, isoquinolinediones, isoquinolinetriones and dihydroisoquinolinones of the general formula (I) or their respective salts
where the radicals in the general formula (I) correspond to the definitions given in the description,
for enhancing stress tolerance in plants to abiotic stress, for strengthening plant growth and/or for increasing plant yield, and selected processes for preparing the compounds mentioned above.
Stereoselective Multicomponent Reactions Using Zincate Nucleophiles: β-Dicarbonyl Synthesis and Functionalization
作者:Stephen K. Murphy、Mingshuo Zeng、Seth B. Herzon
DOI:10.1021/acs.orglett.6b02320
日期:2016.10.7
A general strategy for conjugate addition-C-acylation that enables the synthesis of enantioenriched β-dicarbonyl compounds is described. A novel method for derivatizing these adducts by stereo- and site-selective zinc-catalyzed addition of alkyllithium reagents is also reported. These reactions can be performed in tandem to achieve an enantio- and diastereoselective four-component coupling. The in
Photolysis of 2,4-dimethyl-1-phenylpentane-1,3-dione (1) in the presence of oxygen gave 2,2,4-trimethyl-5-phenylfuran-3(2H)-one (2) and 6-hydroxy-3,3,5-trimethyl-6-phenyl-1,2-dioxan-4-one (3)via the interaction of the type II biradical with oxygen.
Photochemical Reaction of Phenyl-substituted 1,3-Diketones
作者:Michikazu Yoshioka、Tsuneji Suzuki、Masashi Oka
DOI:10.1246/bcsj.57.1604
日期:1984.6
type II cyclization product, 3-hydroxy-2,2,4-trimethyl-3-phenylcyclobutanone or 3-hydroxy-2,2,4,4-tetramethyl-3-phenylcyclobutanone, along with type I cleavage products. The type II cyclization/type I cleavage ratio is greater with a 3-isopropyl group than with a 3-ethyl group. A similar irradiation of 2,2-dimethyl-1-phenyl-1,3-butanedione gave type I cleavage products and no type II cyclization product
辐照具有 3-乙基或 3-异丙基取代基的 2,2-二甲基-1-苯基-1,3-二酮得到 II 型环化产物,3-羟基-2,2,4-三甲基-3-苯基环丁酮或 3-羟基-2,2,4,4-四甲基-3-苯基环丁酮,以及 I 型裂解产物。3-异丙基的 II 型环化/I 型裂解比大于 3-乙基。2,2-二甲基-1-苯基-1,3-丁二酮的类似辐照得到I型裂解产物而没有II型环化产物。2,4-二甲基-1-苯基-1,3-戊二酮的辐照得到3-羟基-2,2,4-三甲基1-3-苯基环丁酮和苯丙酮。由 2,2-二甲基-1-苯基-1,3-戊二酮产生的 3-羟基-2,2,4-三甲基-3-苯基环丁酮的几何结构相对于苯基和 4-甲基是顺式的,而来自 2,4-二甲基-1-苯基-1,
Enantioselective Monoreduction of 2-Alkyl-1,3-diketones Mediated by Chiral Ruthenium Catalysts. Dynamic Kinetic Resolution
作者:Florence Eustache、Peter I. Dalko、Janine Cossy
DOI:10.1021/ol025527q
日期:2002.4.1
The reduction of 2-alkyl-1,3-diketones using (R,R)- or (S,S)-RuCl[N-(tosyl)-1,2-diphenylethylenediamine](p-cymene) in the presence of formic acid and triethylamine affords syn-2-alkyl-3-hydroxy ketones as the major products with high enantioselectivity. [reaction: see text]