The first total synthesis or (-)-aplyolide A(+). (16S)-methyloxacyclohexadeca-(5Z, 8Z, 11Z, 14Z)-tetraen-2-one, 1 is reported. The synthesis is based on three consecutive couplings of terminal alkynes with propargylic halides and proves the absolute configuration of the stereogenic center of the natural product. (C) 2001 Elsevier Science Ltd. All rights reserved.
Discovery and Design of Family VIII Carboxylesterases as Highly Efficient Acyltransferases
作者:Henrik Müller、Simon P. Godehard、Gottfried J. Palm、Leona Berndt、Christoffel P. S. Badenhorst、Ann‐Kristin Becker、Michael Lammers、Uwe T. Bornscheuer
DOI:10.1002/anie.202014169
日期:2021.1.25
water, which enabled the synthesis of the drug moclobemide from methyl 4‐chlorobenzoate and 4‐(2‐aminoethyl)morpholine (ca. 20 % conversion). We solved the crystal structure of EstCE1 and detailed structure–function analysis revealed a three‐amino acid motif important for promiscuous acyltransferase activity. Introducing this motif into an esterase without acetyltransferase activity transformed a “hydrolase”
Ester Synthesis in Water: <i>Mycobacterium smegmatis</i>
Acyl Transferase for Kinetic Resolutions
作者:Nicolas de Leeuw、Guzman Torrelo、Carolin Bisterfeld、Verena Resch、Luuk Mestrom、Emanuele Straulino、Laura van der Weel、Ulf Hanefeld
DOI:10.1002/adsc.201701282
日期:2018.1.17
The acyl transferase from Mycobacterium smegmatis (MsAcT) catalyses transesterification reactions in aqueous media because of itshydrophobic active site. Aliphatic cyanohydrin and alkyne esters can be synthesised in water with excellent and strikingly opposite enantioselectivity [(R);E>37 and (S);E>100, respectively]. When using this enzyme, the undesired hydrolysis of the acyl donor is an important
Elucidating absolute configuration of unsaturated alcohols via enantioselective acylation reactions
作者:Christina M. LeGay、Colton G. Boudreau、Darren J. Derksen
DOI:10.1039/c3ob40709h
日期:——
Enantioselective nucleophilic acylation catalysis provides a simple method of determining absolute configuration for unsaturated alcohols. Extension of this technique to natural products and synthetic compounds, as well as current limitations of this approach, are also described.