The first total synthesis of oxazolomycin A, a structurally novel oxazole polyene gamma-lactam/beta-lactone antibiotic, is described. Key features Include the stereocontrolled construction of the right-hand heterocyclic core by taking advantage of an In(III)-catalyzed Conia-ene type cyclization and the asymmetric synthesis of the left-hand segment starting with a Cinchona alkaloid-catalyzed cyclocondensation of an aldehyde with an acid chloride.
The first total synthesis of oxazolomycin A, a structurally novel oxazole polyene gamma-lactam/beta-lactone antibiotic, is described. Key features Include the stereocontrolled construction of the right-hand heterocyclic core by taking advantage of an In(III)-catalyzed Conia-ene type cyclization and the asymmetric synthesis of the left-hand segment starting with a Cinchona alkaloid-catalyzed cyclocondensation of an aldehyde with an acid chloride.
Asymmetric Synthesis of the Fully Elaborated Pyrrolidinone Core of Oxazolomycin A
作者:Timothy J. Donohoe、Timothy J. C. O’Riordan、Manuel Peifer、Christopher R. Jones、Timothy J. Miles
DOI:10.1021/ol302541j
日期:2012.11.2
The asymmetric synthesis of the key pyrrolidinone core, including a highly elaborated exocyclic carbon chain, of the γ-lactam β-lactone antibiotic oxazolomycin A is described. Principal features include the Birch reduction of an aromatic pyrrole nucleus, a late stage RuO4 catalyzed pyrrolidine oxidation, and a highly diastereoselective organocerium addition to an aldehyde.
Stereoselective synthesis of the right-hand cores of 16-methylated oxazolomycins
作者:Kohei Eto、Jun Ishihara、Susumi Hatakeyama
DOI:10.1016/j.tet.2017.12.036
日期:2018.2
The right-hand heterocyclic cores of oxazolomycins having either 16R or 16S-methyl group configurations on the beta-lactones were stereoselectively synthesized from the common intermediate utilized for our previous syntheses of neooxazolomycin and oxazolomycin A. In addition, the right-hand segment required for the synthesis of KSM-2690 and lajollamycin members was also synthesized in a stereo-selective manner. (C) 2017 Elsevier Ltd. All rights reserved.