Heterogeneous Catalysis with Basic Compounds to Achieve the Synthesis and C–N Cleavage of Azetidin-2-ones under Microwave Irradiation
作者:Adriana Galván、Fabiola N. de la Cruz、Francisco Cruz、Merced Martínez、Clarisa Villegas Gomez、Yolanda Alcaraz、José Manuel Domínguez、Francisco Delgado、Miguel A. Vázquez
DOI:10.1055/s-0037-1611851
日期:2019.10
scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM). The synthesis of azetidin-2-ones with a completely heterogeneous catalysis is reported. The use of basic compounds as solid catalysts allowed for the synthesis of azetidin-2-ones undermicrowaveirradiation without organic additives such as triethylamine. An excellent catalyst for this transformation was
Paclitaxel Biosynthesis: Adenylation and Thiolation Domains of an NRPS TycA PheAT Module Produce Various Arylisoserine CoA Thioesters
作者:Ruth Muchiri、Kevin D. Walker
DOI:10.1021/acs.biochem.6b01188
日期:2017.3.14
Structure–activity relationship studies show that the phenylisoserinyl moiety of paclitaxel (Taxol) is largely necessary for the effective anticancer activity. Several paclitaxel analogues with a variant isoserinyl side chain have improved pharmaceutical properties versus those of the parent drug. To produce the isoserinyl CoAs as intermediates needed for enzyme catalysis on a semibiosynthetic pathway
Lipase-catalyzed resolution of 4-aryl-substituted β-lactams: effect of substitution on the 4-aryl ring
作者:Jason A Carr、Talal F Al-Azemi、Timothy E Long、Jeung-Yeop Shim、Cristina M Coates、Edward Turos、Kirpal S Bisht
DOI:10.1016/j.tet.2003.09.057
日期:2003.11
reactions occurred with high enantioselectivity and substrate conversion. The effect of substitution on the C-4 aryl ring on lipase hydrolytic activity was dependent upon the steric and electronic nature of the substituent and its position on the aryl ring. The stereopreference of the lipase PS-30 for the (3S,4R) enantiomer was rationalized using a known active site model. Absolute stereochemistry of the