2406-22-6Relevant articles and documents
Synthesis and stereoselective evaluation of a (1R)-(–)-myrtenal-derived pseudo C2-symmetric dodecaheterocycle as a potential heterofunctional chiral auxiliary
Sánchez-Chávez, Anahí C.,Elena Vargas-Díaz, Ma.,Ontiveros-Rodríguez, Julio C.,Pérez-Estrada, Salvador,Flores-Bernal, Gustavo G.,Mendoza-Espinosa, Daniel,álvarez-Hernández, Alejandro,Delgado, Francisco,Tamariz, Joaquín,Gerardo Zepeda-Vallejo
, p. 4437 - 4441 (2018)
The synthesis and diastereoselective performance of the pseudo C2-symmetric dodecaheterocycle 3 in nucleophilic and electrophilic reactions are reported. Compound 3 proved to be a highly diastereoselective template to generate a pair of enantiomeric moieties within its structure in a programmed manner. Hence, this study describes the synthesis of a novel potential heterobifunctional chiral auxiliary.
Chiral-auxiliary-controlled diastereoselectivity in the epoxidation of enecarbamates with DMD and mCPBA
Adam, Waldemar,Bosio, Sara G.,Wolff, Barbara T.
, p. 819 - 822 (2003)
(Matrix presented) Chiral oxazolidinone-substituted enecarbamates 1 are epoxidized in a diastereoselectivity up to 93:7 for both DMD and mCPBA. The diastereofacial differentiation depends on the steric interaction between the R1 substituent on the oxazolidinone ring and the incoming electrophile. The stereochemical course of epoxidation was assessed by chemical correlation with the known optically active diols.
An improved version of the Sharpless asymmetric dihydroxylation
Mehltretter,Dobler,Sundermeier,Beller
, p. 8083 - 8087 (2000)
The osmium catalyzed asymmetric dihydroxylation of olefins (Sharpless AD) was studied under controlled pH conditions. It was found that providing a constant pH value of 12.0 leads to improved reaction rates for internal olefins. Hydrolysis aids such as methanesulfonamide can be omitted. For terminal olefins, working at a constant pH of 10.0 at room temperature leads to higher enantioselectivities compared to AD reactions without pH control. (C) 2000 Elsevier Science Ltd.
Absolute stereochemical determination of 1,2-diols via complexation with dinaphthyl borinic acid
Torabi Kohlbouni, Saeedeh,Sarkar, Aritra,Zhang, Jun,Li, Xiaoyong,Borhan, Babak
supporting information, p. 817 - 823 (2020/03/26)
Rapid derivatization of chiral 1,2-diols with dinaphthyl borinic acid (DBA) leads to a cyclic boronate, enabling the absolute stereochemical prediction via exciton-coupled circular dichroic (ECCD) of the naphthyl groups. Aryl- and alkyl-substituted 1,2-diols derivatized with DBA yield a predictable ECCD, which is also in agreement with theoretical predictions derived from computationally minimized structures.
Syn-dihydroxylation of alkenes using a sterically demanding cyclic diacyl peroxide
Pilevar, Afsaneh,Hosseini, Abolfazl,Becker, Jonathan,Schreiner, Peter R.
, p. 12377 - 12386 (2019/10/11)
The syn-dihydroxylation of alkenes is a highly valuable reaction in organic synthesis. Cyclic acyl peroxides (CAPs) have emerged recently as promising candidates to replace the commonly employed toxic metals for this purpose. Here, we demonstrate that the structurally demanding cyclic peroxide spiro[bicyclo[2.2.1]heptane-2,4′-[1,2]dioxolane]-3′,5′-dione (P4) can be effectively used for the syn-dihydroxylation of alkenes. Reagent P4 also shows an improved selectivity for dihydroxylation of alkenes bearing β-hydrogens as compared to other CAPs, where both diol and allyl alcohol products compete with each other. Furthermore, the use of enantiopure P4 (labeled P4′) demonstrates the potential of P4′ for a metal-free asymmetric syn-dihydroxylation of alkenes.