[EN] SYSTEMS AND METHODS FOR REGIOSELECTIVE CARBONYLATION OF 2,2-DISUBSTITUTED EPOXIDES<br/>[FR] SYSTÈMES ET PROCÉDÉS DE CARBONYLATION RÉGIOSÉLECTIVE D'ÉPOXYDES 2,2-DISUBSTITUÉS
申请人:UNIV CORNELL
公开号:WO2020102816A1
公开(公告)日:2020-05-22
Provided are methods of carbonylating cyclic substrates to produce carbonyl ated cyclic products. The cyclic substrates may be 2, 2-di substituted epoxides and the cyclic products may be β,β-di substituted lactones. The method may be carried out by forming and pressurizing a reaction mixture of the cyclic substrate, a solvent, carbon monoxide, and a [LA+][CO(CO)4-] catalyst, where [LA+] is a Lewis acid capable of coordinating to the cyclic substrate. The method may proceed with a regioselectivity of 90:10 or greater. The resulting carbonylated cyclic products may be converted to ketone aldol products that retain the stereochemistry and enantiomeric ratio of the carbonyl ated cyclic products.
A phosphonium ylide as a visible light organophotoredox catalyst
作者:Yasunori Toda、Katsumi Tanaka、Riki Matsuda、Tomoyuki Sakamoto、Shiho Katsumi、Masahiro Shimizu、Fuyuki Ito、Hiroyuki Suga
DOI:10.1039/d1cc00996f
日期:——
A phosphonium ylide-based visible light organophotoredox catalyst has been designed and successfully applied to halohydrin synthesis using trichloroacetonitrile and epoxides. An oxidative quenching cycle by the ylide catalyst was established, which was confirmed by experimental mechanistic studies.
Anionic ring-opening polymerization of cyclic 1,3-dithiocarbonate and thermal depolymerization
作者:Su Jin Jeon、Min-young Jung、Jung Yun Do
DOI:10.1016/j.reactfunctpolym.2016.01.005
日期:2016.3
Abstract A new anionic ring-opening polymerization (ROP) was used to synthesize polydithiocarbonates from cyclic dithiocarbonates. The polymerization was optimized in the presence of dibenzo-18-C-6 and NaH/EtOH, and carried out at 50 °C to suppress any retropolymerization. Six- and seven-membered cyclic dithiocarbonates underwent ROP to afford the corresponding polymers. Thermal depolymerization of
摘要用一种新型的阴离子开环聚合法(ROP)从环状二硫代碳酸酯合成聚二硫代碳酸酯。在二苯并-18-C-6和NaH / EtOH的存在下优化聚合反应,并在50°C进行以抑制任何逆聚合。对六元和七元环状二硫代碳酸酯进行ROP,得到相应的聚合物。制备的聚合物的热解聚反应生成二聚体,根据1H核磁共振(NMR)光谱,发现该二聚体是一种反咬合机理。线型聚合物的特征结构通过1 H NMR和13 C NMR光谱法确定,并与单体进行比较。80°C下的ROP表现出被二聚体污染的聚合物的形成。
Method of using calcilytic compounds
申请人:NPS Pharmaceuticals, Inc.
公开号:US06022894A1
公开(公告)日:2000-02-08
The present invention features calcilytic compounds. "Calcilytic compounds" refer to compounds able to inhibit calcium receptor activity. Also described are the use of calcilytic compounds to inhibit calcium receptor activity and/or achieve a beneficial effect in a patient; and techniques which can be used to obtain additional calcilytic compounds.
Titanocene-Catalyzed Reductive Domino Epoxide Ring Opening/Defluorinative Cross-Coupling Reaction
作者:Zhiyang Lin、Yun Lan、Chuan Wang
DOI:10.1021/acs.orglett.0c00960
日期:2020.5.1
method for efficient synthesis of gem-difluorobishomoallylic alcohols starting from trifluoromethyl-substituted alkenes and epoxides via a titanocene-catalyzed reductive domino reaction, which consists of a Ti(III)-mediated radical-type ring opening and the following allylic defluorinative cross-coupling reaction via sequential radical addition and β-F elimination. Notably, complete regioselectivity and