Studies toward asymmetric synthesis of hoiamides A and B
作者:Ming Li、Pan Han、Zhuo-Ya Mao、Wen Zhou、Chang-Mei Si、Juan Xiong、Bang-Guo Wei、Jin-Feng Hu
DOI:10.1016/j.tetlet.2016.11.004
日期:2016.12
for diastereoselective synthesis of the key intermediate 5 from triheterocyclic fragment and polyketide 6 for hoiamides A (1) and B (2) was developed. The main feature is the successive construction of four stereogenic centers from C33 to C36 for hoiamides A (1) through the well-established Oppolzer’s anti-aldol and Paterson’s anti-aldol methodology. Furthermore, asymmetric allylation was also utilized
Three cloned enoate reductases from the “old yellow enzyme” family of flavoproteins were investigated in the asymmetricbioreduction of activatedalkenes. 12-Oxophytodienoatereductaseisoenzymes OPR1 and OPR3 from Lycopersicon esculentum (tomato), and YqjM from Bacillus subtilis displayed a remarkably broad substrate spectrum by reducing α,β-unsaturated aldehydes, ketones, maleimides and nitroalkenes
Biocatalysis with Thermostable Enzymes: Structure and Properties of a Thermophilic ‘ene’-Reductase related to Old Yellow Enzyme
作者:Björn V. Adalbjörnsson、Helen S. Toogood、Anna Fryszkowska、Christopher R. Pudney、Thomas A. Jowitt、David Leys、Nigel S. Scrutton
DOI:10.1002/cbic.200900570
日期:2010.1.25
A hot, new OldYellowEnzyme: We describe the X‐ray crystal structure of a new thermostableOldYellowEnzyme, and report its kinetic properties, thermo‐ and solvent stability, and biocatalytic potential. The markedly improved solvent stability of the enzyme shows great potential for applications in industrial‐scale biotransformations.
一种热的新旧黄色酶:我们描述了一种新的耐热旧黄色酶的 X 射线晶体结构,并报告了其动力学特性、热稳定性和溶剂稳定性以及生物催化潜力。该酶显着改善的溶剂稳定性显示出在工业规模生物转化中的巨大应用潜力。
Horner-Wadsworth-Emmons Reactions as a Facile Entry to Biogenetic Key Substructures
作者:Johann Mulzer、Andreas Sieg、Christoph Brücher、Dieter Müller、Harry J. Martin
DOI:10.1055/s-2005-863705
日期:——
One-pot Horner-Wadsworth-Emmons reactions are used to synthesize α,β-enones with two configurationally independent stereogenic centers. These intermediates are used for the construction of polyketide and monosaccaride fragments. In particular, novel approaches to the branched pentoses mycarose and arcanose are described.
A new type of chiral sulfoniumsalts that are characterized by a bicyclic system has been designed and synthesized from α‐amino acids. Their corresponding ylides, which were prepared by basic treatment of the sulfoniumsalts, reacted smoothly with a broad array of simple and chiral aldehydes to provide trans‐epoxy amides in reasonable to very good yields and excellent stereoselectivities (>98 %). The