Enzymes in organic synthesis 51. Probing the dimensions of the large hydrophobic pocket of the active site of pig liver esterase
作者:Louis Provencher、Hla Wynn、J.Bryan Jones、Andrzej R. Krawczyk
DOI:10.1016/s0957-4166(00)82251-x
日期:1993.1
The dimensions of the large hydrophobic pocket (H(L)) of the active site model of pig liver esterase (PLE) were probed using a series of aliphatic and phenylic malonates. Results from the hydrolyses of these new unnatural substrates permitted the extension of the H(L) pocket to give the new dimensions of 6.2 x 2.3 x 3.9 angstrom for a total volume of approximately 56 angstrom3.
Stereochemistry of Hexenyl Radical Cyclizations with <i>tert</i>-Butyl and Related Large Groups: Substituent and Temperature Effects
作者:Jonathan C. Tripp、Carl H. Schiesser、Dennis P. Curran
DOI:10.1021/ja042595u
日期:2005.4.1
The long held notion that hexenyl radicals bearing large substituents on the radical carbon cyclize to give 1,2-trans-substituted cyclopentanes is experimentally disproved by study of the radical cyclization of an assortment of simple and complex substrates coupled with careful product analysis and rigorous assignment of configurations. X-ray studies and syntheses of authentic samples establish that