ABSTRACT
The title compound, C(13)H(18)Br(2)O(3), was prepared by a bromination reaction of (1E,3Z)-methyl 5-oxocyclo-octa-1,3-diene-carboxyl-ate, which was obtained by an ep-oxy-dation reaction of tert-butyl cyclo-oct-1,3-diene-carboxyl-ate. The crystal structure confirms unequivocally the absolute configuration of both chiral centres to be S. In the crystal, C-Hâ¯O inter-actions link the mol-ecules into chains running along the c axis.
ABSTRACT
The design of biologically inspired, multi-component cascade reactions enables the targeted synthesis of assorted structurally complex products. Similar to regulation in cells the reaction path is controlled by the substrate concentration and complex enantiopure products with high structural diversity are provided.
Subject(s)
Biomimetic Materials/chemical synthesis , Biomimetics/methods , Catalysis , StereoisomerismABSTRACT
El pterigion es una alteración caracterizada por la proliferación anormal del tejido conjuntival, en algunos individuos crece a tal punto que puede afectar el eje visual. Ha sido considerada por diferentes autores como una lesión neoplásica debido a que presenta características propias de los tejidos tumorales. Se llevó a cabo una revisión sistemática de artículos científicos a partir de los cuales se respalda la propuesta hecha por Clear et al, quienes sugieren por primera vez la asociación entre la enfermedad y las neoplasias, para esto, se resaltan evidencias moleculares reportadas en los genes p53, p21 y COX-2, cuyos polimorfismos se han relacionado con la presencia de tumores, e identificados en algunos casos de pterigion.
Pterygium is an alteration characterized by the abnormal proliferation of the conjunctive tissue, in some people it can grow to the point off affecting the visual axis. It has been considered by different authors like a neoplastic injury because it has some characteristics like tumor tissues. It was carried out a systematic review of scientific articles with molecular evidences that supports the proposal showed by Clear et al, about the association between the disease and neoplasias, based on researches in the genes p53, p21 and COX-2, whose polymorphisms have been related with the presence of tumors, and also they have been identified in patients with pterygium.
