15448-47-2Relevant academic research and scientific papers
Stereoselective concise total synthesis of leodomycin C and D
Chinnababu,Reddy, S. Purushotham,Reddy, D. Kumar,Rao, D. Chandra,Venkateswarlu
, p. 311 - 315 (2012)
Stereoselective concise total synthesis of leodomycin C and D from commercially available propylene oxide using Jacobsens hydrolytic kinetic resolution (HKR), base-promoted alkyne zipper reaction, TPP-promoted enyne ester (ynoate) to diene ester (dienoate
In-Situ Monitoring of Enantiomeric Excess during a Catalytic Kinetic Resolution
Mower, Matthew P.,Blackmond, Donna G.
, p. 5977 - 5982 (2018)
Vibrational Circular Dichroism combined with FTIR spectroscopy (VCD-IR) is demonstrated as a viable tool for the in situ measurement of enantiomeric excess during asymmetric catalytic transformations. Employing the Jacobsen (salen)Co-catalyzed hydrolytic kinetic resolution of racemic epoxides as a proof-of-concept case study, methodology is developed to monitor the enantiomeric excess of the epoxide substrate as a function of conversion of the limiting reactant, water. Comparison of results for monomeric and oligomeric catalysts probes the molecularity of the catalyst by investigating nonlinear effects in catalyst enantiopurity. These results are in excellent agreement with previous mechanistic investigations of this reaction based on kinetic measurements and computational studies.
A practical synthesis of both enantiomers of 1-amino-2-propanol and propylene oxide
Rossen,Simpson,Wells
, p. 1071 - 1074 (1993)
A practical large-scale synthesis of both enantiomers of 1-amino-2-propanol 1 from L- and D-threonine is described. Greater than 99% e.e. propylene oxide 2 is obtained from 1 through a diazotization under basic conditions.
Alternating copolymerization of CO2 and propylene oxide catalyzed by CoIII(salen)/Lewis base
Paddock, Robert L.,Nguyen, SonBinh T.
, p. 6251 - 6253 (2005)
The use of CoIII(salen)/Lewis base catalyst system for copolymerization of CO2 and propylene oxide was analyzed. The ratio of catalyst to Lewis base cocatalyst influenced the TOF. The use of Lewis base cocatalyst enables high catalytic activity at low CO2 pressure and affords superior enantioselectivity. The results show that the use of cocatalyst produced a highly alternating monodisperse polycarbonate product without concomitant cyclic carbonate production.
A Combined Microbial/Chemical Synthesis of (+)-(R)-Methyloxirane Having High Enantiomeric Excess
Simon, Ethan S.,Whitesides, George M.,Cameron, Douglas C.,Weitz, David J.,Cooney, Charles L.
, p. 4042 - 4044 (1987)
Clostridium thermosaccharolyticum (ATCC 31960) converts glucose to (-)-(R)-propylene glycol; standard procedures transform this substance to (+)-(R)-methyloxirane ((+)-(R)-propylene oxide) with enantiomeric excess >99percent.This procedure is capable of generating this useful chiral synthon on a large scale.
Chiral catalysts for the asymmetric cycloaddition of carbon dioxide with epoxides
Jin, Lili,Huang, Yongzhong,Jing, Huanwang,Chang, Tao,Yan, Peng
, p. 1947 - 1953 (2008)
Several chiral BINADCo(III)X (BINAD = Bis(1,1′-2-hydroxy-2′-alkoxy-3-naphthylidene)-1,2-cyclohexanediamine, X = OAc, CF3CO2, CCl3CO2, OTs, p-NO2PhCO2) complexes were synthesized and used to
Regioselective Cyclodehydration of Chiral Diols with Diethoxytriphenylphosphorane, Triphenylphosphine-Tetrachloromethane-Potassium Carbonate, and Triphenylphosphine-Diethyl Azodicarboxylate Reagents. A Comparative Study
Robinson, Philip L.,Barry, Carey N.,Bass, S. Woody,Jarvis, Susan E.,Evans, Slayton A.
, p. 5396 - 5398 (1983)
The regioselectivity of cyclodehydration of chiral diols has been examined with the reagents diethoxytriphenylphosphorane, triphenylphosphine-tetrachloromethane-potassium carbonate, and triphenylphosphine-diethyl azodicarboxylate. (S)-(+)-Propane-1,2-diol and (R)-(-)-pentane-1,4-diol afford 80-87percent retention of stereochemistry at the chiral carbon in the ether while (S)-(+)-phenylethane-1,2-diol affords essentially racemic styrene oxide with all three reagents.
Total synthesis of the proposed structures of eushearilide
Yamauchi, Takayasu,Takidaira, Jun-Ichi,Okamoto, Kenya,Sugiura, Takaya,Horikoshi, Hiroki,Kudo, Shintaro,Sasaki, Shigeru,Mizushima, Noriko,Higashiyama, Kimio
, p. 1175 - 1189 (2014)
Total synthesis of (3R,16Z,20E,23S)- and (3R,16Z,20E,23R)-eushearilide was accomplished in 15 steps, respectively. Using either enantiomer of one of the four building blocks to assemble the phosphonium salt for the latter Wittig reaction, two diastereomers of eushearilide were prepared. Shiina macrolactonization (2-methyl-6-nitrobenzoic anhydride) was a key step in production of the 24-membered lactone in high yield.
Enantioselective Resolution Copolymerization of Racemic Epoxides and Anhydrides: Efficient Approach for Stereoregular Polyesters and Chiral Epoxides
Li, Jie,Ren, Bai-Hao,Wan, Zhao-Qian,Chen, Shi-Yu,Liu, Ye,Ren, Wei-Min,Lu, Xiao-Bing
supporting information, p. 8937 - 8942 (2019/06/11)
Herein we report an efficient strategy for preparing isotactic polyesters and chiral epoxides via enantioselective resolution copolymerization of racemic terminal epoxides with anhydrides, mediated by enantiopure bimetallic complexes in conjunction with a nucleophilic cocatalyst. The chirality of both the axial linker and the diamine backbones of the ligand are responsible for the chiral induction of this kinetic resolution copolymerization process. The catalyst systems exhibit exceptional levels of enantioselectivity with a kinetic resolution coefficient exceeding 300 for various racemic epoxides, affording highly isotactic copolymers (selectivity factors of more than 300) with a completely alternating structure and low polydispersity index. Most of the produced isotactic polyesters are typical semicrystalline materials with melting temperatures in the range from 77 to 160 °C.
A (R)- single thio propylene carbonate preparation method (by machine translation)
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Paragraph 0007-0008; 0028-0029; 0031-0032, (2018/03/28)
The invention relates to a (R)- single thio propylene carbonate preparation method, including: (1) epoxy propane, epoxy hydrolase ECU1040 is mixed with water, for 0 - 5 °C reaction 10 - 40 hours, stopping the reaction, normal pressure is distilled to produce (R)- propylene oxide; (2) the above the resulting (R)- propylene oxide is mixed with organic solvent, adding carbonylation and alkali and organic amine, in the 10 - 30 °C under stirring into the carbonyl sulfide gas, until the oxysulfide until the gas does not absorb, the total reaction time is 15 - 30 hours, to obtain the (R)- single thio propylene carbonate ester. Preparation method of the invention normal pressure operation, high yield, simple and practical, low risk, less equipment investment, optical purity of the product to achieve 99% e.e value or more, and has excellent industrial prospect. (by machine translation)

